13979691 has 12 divisors (see below), whose sum is σ = 22028760. Its totient is φ = 8472480.

The previous prime is 13979689. The next prime is 13979717. The reversal of 13979691 is 19697931.

It is not a de Polignac number, because 13979691 - 2¹ = 13979689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13979671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70506 + ... + 70703.

It is an arithmetic number, because the mean of its divisors is an integer number (1835730).

Almost surely, 2^13979691 is an apocalyptic number.

13979691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13979691 is a deficient number, since it is larger than the sum of its proper divisors (8049069).

13979691 is a wasteful number, since it uses less digits than its factorization.

13979691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141226 (or 141223 counting only the distinct ones).

The product of its digits is 91854, while the sum is 45.

The square root of 13979691 is about 3738.9424975519. The cubic root of 13979691 is about 240.8976281632.

The spelling of 13979691 in words is "thirteen million, nine hundred seventy-nine thousand, six hundred ninety-one".