155809900 has 18 divisors (see below), whose sum is σ = 338107700. Its totient is φ = 62323920.

The previous prime is 155809891. The next prime is 155809909. The reversal of 155809900 is 9908551.

It is an interprime number because it is at equal distance from previous prime (155809891) and next prime (155809909).

It is a self number, because there is not a number n which added to its sum of digits gives 155809900.

It is not an unprimeable number, because it can be changed into a prime (155809909) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 778950 + ... + 779149.

Almost surely, 2^155809900 is an apocalyptic number.

155809900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155809900 is an abundant number, since it is smaller than the sum of its proper divisors (182297800).

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

155809900 is a wasteful number, since it uses less digits than its factorization.

155809900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558113 (or 1558106 counting only the distinct ones).

The product of its (nonzero) digits is 16200, while the sum is 37.

The square root of 155809900 is about 12482.3835864790. The cubic root of 155809900 is about 538.1025080720.

The spelling of 155809900 in words is "one hundred fifty-five million, eight hundred nine thousand, nine hundred".