155812900 has 18 divisors (see below), whose sum is σ = 338114210. Its totient is φ = 62325120.

The previous prime is 155812897. The next prime is 155812907. The reversal of 155812900 is 9218551.

It can be written as a sum of positive squares in 3 ways, for example, as 53114944 + 102697956 = 7288^2 + 10134^2 .

It is not an unprimeable number, because it can be changed into a prime (155812907) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 778965 + ... + 779164.

Almost surely, 2^155812900 is an apocalyptic number.

155812900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

155812900 is an abundant number, since it is smaller than the sum of its proper divisors (182301310).

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

155812900 is a wasteful number, since it uses less digits than its factorization.

155812900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1558143 (or 1558136 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 31.

The square root of 155812900 is about 12482.5037552568. The cubic root of 155812900 is about 538.1059616334.

It can be divided in two parts, 15581 and 2900, that added together give a palindrome (18481).

The spelling of 155812900 in words is "one hundred fifty-five million, eight hundred twelve thousand, nine hundred".