12691618 has 16 divisors (see below), whose sum is σ = 19860480. Its totient is φ = 6075216.

The previous prime is 12691583. The next prime is 12691621. The reversal of 12691618 is 81619621.

It is a super-2 number, since 2×12691618² = 322154334915848, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6505 + ... + 8227.

It is an arithmetic number, because the mean of its divisors is an integer number (1241280).

Almost surely, 2^12691618 is an apocalyptic number.

12691618 is a deficient number, since it is larger than the sum of its proper divisors (7168862).

12691618 is a wasteful number, since it uses less digits than its factorization.

12691618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881.

The product of its digits is 5184, while the sum is 34.

The square root of 12691618 is about 3562.5297191743. The cubic root of 12691618 is about 233.2593157518.

The spelling of 12691618 in words is "twelve million, six hundred ninety-one thousand, six hundred eighteen".