155969980 has 12 divisors (see below), whose sum is σ = 327537000. Its totient is φ = 62387984.

The previous prime is 155969977. The next prime is 155970047. The reversal of 155969980 is 89969551.

It is a super-2 number, since 2×155969980² = 48653269322400800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3899230 + ... + 3899269.

It is an arithmetic number, because the mean of its divisors is an integer number (27294750).

Almost surely, 2^155969980 is an apocalyptic number.

155969980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155969980 is an abundant number, since it is smaller than the sum of its proper divisors (171567020).

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

155969980 is a wasteful number, since it uses less digits than its factorization.

155969980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7798508 (or 7798506 counting only the distinct ones).

The product of its (nonzero) digits is 874800, while the sum is 52.

The square root of 155969980 is about 12488.7941771814. The cubic root of 155969980 is about 538.2867282152.

The spelling of 155969980 in words is "one hundred fifty-five million, nine hundred sixty-nine thousand, nine hundred eighty".