215164986 has 16 divisors (see below), whose sum is σ = 444211968. Its totient is φ = 69408000.

The previous prime is 215164979. The next prime is 215164997. The reversal of 215164986 is 689461512.

It is an unprimeable number.

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, 578215 + ... + 578586.

It is an arithmetic number, because the mean of its divisors is an integer number (27763248).

Almost surely, 2^215164986 is an apocalyptic number.

215164986 is an abundant number, since it is smaller than the sum of its proper divisors (229046982).

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

215164986 is a wasteful number, since it uses less digits than its factorization.

215164986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1156837.

The product of its digits is 103680, while the sum is 42.

The square root of 215164986 is about 14668.5031956229. The cubic root of 215164986 is about 599.2258404468.

The spelling of 215164986 in words is "two hundred fifteen million, one hundred sixty-four thousand, nine hundred eighty-six".