155989806 has 16 divisors (see below), whose sum is σ = 356548224. Its totient is φ = 44568504.

The previous prime is 155989787. The next prime is 155989819. The reversal of 155989806 is 608989551.

155989806 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

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, 1856980 + ... + 1857063.

It is an arithmetic number, because the mean of its divisors is an integer number (22284264).

Almost surely, 2^155989806 is an apocalyptic number.

155989806 is an abundant number, since it is smaller than the sum of its proper divisors (200558418).

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

155989806 is a wasteful number, since it uses less digits than its factorization.

155989806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3714055.

The product of its (nonzero) digits is 777600, while the sum is 51.

The square root of 155989806 is about 12489.5879035299. The cubic root of 155989806 is about 538.3095352120.

The spelling of 155989806 in words is "one hundred fifty-five million, nine hundred eighty-nine thousand, eight hundred six".