115121900 has 36 divisors (see below), whose sum is σ = 260681232. Its totient is φ = 44045760.

The previous prime is 115121899. The next prime is 115121927. The reversal of 115121900 is 9121511.

It is a super-2 number, since 2×115121900² = 26506103719220000, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22727 + ... + 27326.

Almost surely, 2^115121900 is an apocalyptic number.

115121900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115121900 is an abundant number, since it is smaller than the sum of its proper divisors (145559332).

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

115121900 is a wasteful number, since it uses less digits than its factorization.

115121900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50090 (or 50083 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 20.

The square root of 115121900 is about 10729.4874062091. The cubic root of 115121900 is about 486.4661764600.

The spelling of 115121900 in words is "one hundred fifteen million, one hundred twenty-one thousand, nine hundred".