918013815 has 12 divisors (see below), whose sum is σ = 1591224024. Its totient is φ = 489607344.

The previous prime is 918013813. The next prime is 918013853. The reversal of 918013815 is 518310819.

It is not a de Polignac number, because 918013815 - 2¹ = 918013813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 918013815.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (918013813) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10200109 + ... + 10200198.

It is an arithmetic number, because the mean of its divisors is an integer number (132602002).

Almost surely, 2^918013815 is an apocalyptic number.

918013815 is a deficient number, since it is larger than the sum of its proper divisors (673210209).

918013815 is a wasteful number, since it uses less digits than its factorization.

918013815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20400318 (or 20400315 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 36.

The square root of 918013815 is about 30298.7427957003. The cubic root of 918013815 is about 971.8884156569. Note that the first 3 decimals are identical.

The spelling of 918013815 in words is "nine hundred eighteen million, thirteen thousand, eight hundred fifteen".