156440400 has 60 divisors (see below), whose sum is σ = 501134592. Its totient is φ = 41717120.

The previous prime is 156440399. The next prime is 156440491. The reversal of 156440400 is 4044651.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 63984 + ... + 66383.

Almost surely, 2^156440400 is an apocalyptic number.

156440400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

156440400 is an abundant number, since it is smaller than the sum of its proper divisors (344694192).

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

156440400 is a wasteful number, since it uses less digits than its factorization.

156440400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130388 (or 130377 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 156440400 is about 12507.6136812743. The cubic root of 156440400 is about 538.8273593656.

The spelling of 156440400 in words is "one hundred fifty-six million, four hundred forty thousand, four hundred".