155904 has 72 divisors (see below), whose sum is σ = 490560. Its totient is φ = 43008.

The previous prime is 155893. The next prime is 155921. The reversal of 155904 is 409551.

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 7 ways as a sum of consecutive naturals, for example, 5362 + ... + 5390.

2¹⁵⁵⁹⁰⁴ is an apocalyptic number.

155904 is a gapful number since it is divisible by the number (14) 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 155904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (245280).

155904 is an abundant number, since it is smaller than the sum of its proper divisors (334656).

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

155904 is an equidigital number, since it uses as much as digits as its factorization.

155904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55 (or 41 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 155904 is about 394.8468057361. The cubic root of 155904 is about 53.8210813676.

The spelling of 155904 in words is "one hundred fifty-five thousand, nine hundred four".