155499972 has 24 divisors (see below), whose sum is σ = 375345600. Its totient is φ = 50045856.

The previous prime is 155499961. The next prime is 155499973. The reversal of 155499972 is 279994551.

It is not an unprimeable number, because it can be changed into a prime (155499973) 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 7 ways as a sum of consecutive naturals, for example, 223072 + ... + 223767.

It is an arithmetic number, because the mean of its divisors is an integer number (15639400).

Almost surely, 2^155499972 is an apocalyptic number.

155499972 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155499972 is an abundant number, since it is smaller than the sum of its proper divisors (219845628).

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

155499972 is a wasteful number, since it uses less digits than its factorization.

155499972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 446875 (or 446873 counting only the distinct ones).

The product of its digits is 1020600, while the sum is 51.

The square root of 155499972 is about 12469.9627906422. The cubic root of 155499972 is about 537.7454838288.

The spelling of 155499972 in words is "one hundred fifty-five million, four hundred ninety-nine thousand, nine hundred seventy-two".