115809885 has 16 divisors (see below), whose sum is σ = 205884480. Its totient is φ = 61765200.

The previous prime is 115809877. The next prime is 115809887. The reversal of 115809885 is 588908511.

It is not a de Polignac number, because 115809885 - 2³ = 115809877 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 115809885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (115809887) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 428791 + ... + 429060.

It is an arithmetic number, because the mean of its divisors is an integer number (12867780).

Almost surely, 2^115809885 is an apocalyptic number.

115809885 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

115809885 is a deficient number, since it is larger than the sum of its proper divisors (90074595).

115809885 is an equidigital number, since it uses as much as digits as its factorization.

115809885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857865 (or 857859 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 45.

The square root of 115809885 is about 10761.5001277703. The cubic root of 115809885 is about 487.4333163227.

It can be divided in two parts, 115 and 809885, that added together give a 4-th power (810000 = 30⁴).

The spelling of 115809885 in words is "one hundred fifteen million, eight hundred nine thousand, eight hundred eighty-five".