155387904 has 96 divisors (see below), whose sum is σ = 473578560. Its totient is φ = 44384256.

The previous prime is 155387867. The next prime is 155387951. The reversal of 155387904 is 409783551.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

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, 41202 + ... + 44814.

It is an arithmetic number, because the mean of its divisors is an integer number (4933110).

Almost surely, 2^155387904 is an apocalyptic number.

155387904 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 155387904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (236789280).

155387904 is an abundant number, since it is smaller than the sum of its proper divisors (318190656).

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

155387904 is an equidigital number, since it uses as much as digits as its factorization.

155387904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3645 (or 3625 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 155387904 is about 12465.4684629179. The cubic root of 155387904 is about 537.6162693489.

The spelling of 155387904 in words is "one hundred fifty-five million, three hundred eighty-seven thousand, nine hundred four".