145023440 has 20 divisors (see below), whose sum is σ = 337179684. Its totient is φ = 58009344.

The previous prime is 145023421. The next prime is 145023491. The reversal of 145023440 is 44320541.

It can be written as a sum of positive squares in 2 ways, for example, as 28987456 + 116035984 = 5384^2 + 10772^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 906317 + ... + 906476.

Almost surely, 2^145023440 is an apocalyptic number.

145023440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

145023440 is an abundant number, since it is smaller than the sum of its proper divisors (192156244).

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

145023440 is a wasteful number, since it uses less digits than its factorization.

145023440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1812806 (or 1812800 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 145023440 is about 12042.5678324849. The cubic root of 145023440 is about 525.3870947124.

Adding to 145023440 its reverse (44320541), we get a palindrome (189343981).

The spelling of 145023440 in words is "one hundred forty-five million, twenty-three thousand, four hundred forty".