145540 has 24 divisors (see below), whose sum is σ = 322560. Its totient is φ = 55008.

The previous prime is 145531. The next prime is 145543. The reversal of 145540 is 45541.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (145543) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189 + ... + 571.

It is an arithmetic number, because the mean of its divisors is an integer number (13440).

2¹⁴⁵⁵⁴⁰ is an apocalyptic number.

145540 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 145540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (161280).

145540 is an abundant number, since it is smaller than the sum of its proper divisors (177020).

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

145540 is a wasteful number, since it uses less digits than its factorization.

145540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 145540 is about 381.4970511026. The cubic root of 145540 is about 52.6010148859.

Subtracting from 145540 its reverse (45541), we obtain a palindrome (99999).

The spelling of 145540 in words is "one hundred forty-five thousand, five hundred forty".