115909540 has 24 divisors (see below), whose sum is σ = 244641600. Its totient is φ = 46129248.

The previous prime is 115909529. The next prime is 115909543. The reversal of 115909540 is 45909511.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 115909496 and 115909505.

It is not an unprimeable number, because it can be changed into a prime (115909543) 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, 10582 + ... + 18541.

It is an arithmetic number, because the mean of its divisors is an integer number (10193400).

Almost surely, 2^115909540 is an apocalyptic number.

115909540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

115909540 is an abundant number, since it is smaller than the sum of its proper divisors (128732060).

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

115909540 is a wasteful number, since it uses less digits than its factorization.

115909540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29331 (or 29329 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 34.

The square root of 115909540 is about 10766.1292951552. The cubic root of 115909540 is about 487.5730891948.

The spelling of 115909540 in words is "one hundred fifteen million, nine hundred nine thousand, five hundred forty".