115905380 has 24 divisors (see below), whose sum is σ = 243605880. Its totient is φ = 46323200.

The previous prime is 115905379. The next prime is 115905389. The reversal of 115905380 is 83509511.

It can be written as a sum of positive squares in 4 ways, for example, as 2184484 + 113720896 = 1478^2 + 10664^2 .

It is a super-2 number, since 2×115905380² = 26868114225888800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (115905389) 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 7 ways as a sum of consecutive naturals, for example, 39980 + ... + 42780.

It is an arithmetic number, because the mean of its divisors is an integer number (10150245).

Almost surely, 2^115905380 is an apocalyptic number.

115905380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115905380 is an abundant number, since it is smaller than the sum of its proper divisors (127700500).

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

115905380 is a wasteful number, since it uses less digits than its factorization.

115905380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4879 (or 4877 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 32.

The square root of 115905380 is about 10765.9360949246. The cubic root of 115905380 is about 487.5672561164.

The spelling of 115905380 in words is "one hundred fifteen million, nine hundred five thousand, three hundred eighty".