13918691 has 4 divisors (see below), whose sum is σ = 14109432. Its totient is φ = 13727952.

The previous prime is 13918687. The next prime is 13918711. The reversal of 13918691 is 19681931.

13918691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19681931 = 31 ⋅634901.

It is a cyclic number.

It is not a de Polignac number, because 13918691 - 2² = 13918687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13918601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 95261 + ... + 95406.

It is an arithmetic number, because the mean of its divisors is an integer number (3527358).

Almost surely, 2^13918691 is an apocalyptic number.

13918691 is a deficient number, since it is larger than the sum of its proper divisors (190741).

13918691 is an equidigital number, since it uses as much as digits as its factorization.

13918691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190740.

The product of its digits is 11664, while the sum is 38.

The square root of 13918691 is about 3730.7761926977. The cubic root of 13918691 is about 240.5467338869.

The spelling of 13918691 in words is "thirteen million, nine hundred eighteen thousand, six hundred ninety-one".