145440 has 72 divisors (see below), whose sum is σ = 501228. Its totient is φ = 38400.

The previous prime is 145433. The next prime is 145441. The reversal of 145440 is 44541.

145440 is nontrivially palindromic in base 11.

It can be written as a sum of positive squares in 2 ways, for example, as 138384 + 7056 = 372^2 + 84^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 145440.

It is not an unprimeable number, because it can be changed into a prime (145441) by changing a digit.

145440 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1390 + ... + 1490.

2¹⁴⁵⁴⁴⁰ is an apocalyptic number.

145440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 145440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (250614).

145440 is an abundant number, since it is smaller than the sum of its proper divisors (355788).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

145440 is a wasteful number, since it uses less digits than its factorization.

145440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122 (or 111 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 145440 is about 381.3659659697. The cubic root of 145440 is about 52.5889648042.

Adding to 145440 its reverse (44541), we get a palindrome (189981).

It can be divided in two parts, 145 and 440, that added together give a palindrome (585).

The spelling of 145440 in words is "one hundred forty-five thousand, four hundred forty".