155991504 has 80 divisors (see below), whose sum is σ = 421560320. Its totient is φ = 49645440.

The previous prime is 155991503. The next prime is 155991509. The reversal of 155991504 is 405199551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155991503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 116889 + ... + 118215.

It is an arithmetic number, because the mean of its divisors is an integer number (5269504).

Almost surely, 2^155991504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 155991504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210780160).

155991504 is an abundant number, since it is smaller than the sum of its proper divisors (265568816).

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

155991504 is a wasteful number, since it uses less digits than its factorization.

155991504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1448 (or 1442 counting only the distinct ones).

The product of its (nonzero) digits is 40500, while the sum is 39.

The square root of 155991504 is about 12489.6558799672. The cubic root of 155991504 is about 538.3114884300.

The spelling of 155991504 in words is "one hundred fifty-five million, nine hundred ninety-one thousand, five hundred four".