155972 has 6 divisors (see below), whose sum is σ = 272958. Its totient is φ = 77984.

The previous prime is 155921. The next prime is 156007. The reversal of 155972 is 279551.

It can be written as a sum of positive squares in only one way, i.e., 118336 + 37636 = 344^2 + 194^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19493 + ... + 19500.

It is an arithmetic number, because the mean of its divisors is an integer number (45493).

2¹⁵⁵⁹⁷² is an apocalyptic number.

It is an amenable number.

155972 is a deficient number, since it is larger than the sum of its proper divisors (116986).

155972 is a wasteful number, since it uses less digits than its factorization.

155972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38997 (or 38995 counting only the distinct ones).

The product of its digits is 3150, while the sum is 29.

The square root of 155972 is about 394.9329056941. The cubic root of 155972 is about 53.8289052027.

The spelling of 155972 in words is "one hundred fifty-five thousand, nine hundred seventy-two".