12991694 has 4 divisors (see below), whose sum is σ = 19487544. Its totient is φ = 6495846.

The previous prime is 12991679. The next prime is 12991703. The reversal of 12991694 is 49619921.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×12991694² = 337568225979272, which contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 3247922 + ... + 3247925.

It is an arithmetic number, because the mean of its divisors is an integer number (4871886).

Almost surely, 2^12991694 is an apocalyptic number.

12991694 is a deficient number, since it is larger than the sum of its proper divisors (6495850).

12991694 is an equidigital number, since it uses as much as digits as its factorization.

12991694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6495849.

The product of its digits is 34992, while the sum is 41.

The square root of 12991694 is about 3604.3992564642. The cubic root of 12991694 is about 235.0833807033.

The spelling of 12991694 in words is "twelve million, nine hundred ninety-one thousand, six hundred ninety-four".