155638812 has 24 divisors (see below), whose sum is σ = 415037056. Its totient is φ = 44468208.

The previous prime is 155638799. The next prime is 155638831. The reversal of 155638812 is 218836551.

It is a congruent number.

It is an unprimeable number.

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, 926338 + ... + 926505.

Almost surely, 2^155638812 is an apocalyptic number.

155638812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

155638812 is an abundant number, since it is smaller than the sum of its proper divisors (259398244).

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

155638812 is a wasteful number, since it uses less digits than its factorization.

155638812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1852857 (or 1852855 counting only the distinct ones).

The product of its digits is 57600, while the sum is 39.

The square root of 155638812 is about 12475.5285258782. The cubic root of 155638812 is about 537.9054803709.

The spelling of 155638812 in words is "one hundred fifty-five million, six hundred thirty-eight thousand, eight hundred twelve".