155015988 has 12 divisors (see below), whose sum is σ = 361704000. Its totient is φ = 51671992.

The previous prime is 155015981. The next prime is 155016007. The reversal of 155015988 is 889510551.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×155015988² = 48059913071232288, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155015981) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6458988 + ... + 6459011.

It is an arithmetic number, because the mean of its divisors is an integer number (30142000).

Almost surely, 2^155015988 is an apocalyptic number.

It is an amenable number.

155015988 is an abundant number, since it is smaller than the sum of its proper divisors (206688012).

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

155015988 is a wasteful number, since it uses less digits than its factorization.

155015988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12918006 (or 12918004 counting only the distinct ones).

The product of its (nonzero) digits is 72000, while the sum is 42.

The square root of 155015988 is about 12450.5416749634. The cubic root of 155015988 is about 537.1870042155.

The spelling of 155015988 in words is "one hundred fifty-five million, fifteen thousand, nine hundred eighty-eight".