155977980 has 24 divisors (see below), whose sum is σ = 436738512. Its totient is φ = 41594112.

The previous prime is 155977963. The next prime is 155978003. The reversal of 155977980 is 89779551.

It is a congruent number.

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, 1299757 + ... + 1299876.

It is an arithmetic number, because the mean of its divisors is an integer number (18197438).

Almost surely, 2^155977980 is an apocalyptic number.

155977980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155977980 is an abundant number, since it is smaller than the sum of its proper divisors (280760532).

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

155977980 is a wasteful number, since it uses less digits than its factorization.

155977980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2599645 (or 2599643 counting only the distinct ones).

The product of its (nonzero) digits is 793800, while the sum is 51.

The square root of 155977980 is about 12489.1144602009. The cubic root of 155977980 is about 538.2959313114.

The spelling of 155977980 in words is "one hundred fifty-five million, nine hundred seventy-seven thousand, nine hundred eighty".