13913691 has 16 divisors (see below), whose sum is σ = 20321280. Its totient is φ = 8397920.

The previous prime is 13913687. The next prime is 13913693. The reversal of 13913691 is 19631931.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13913691 - 2² = 13913687 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (13913693) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 8950 + ... + 10388.

It is an arithmetic number, because the mean of its divisors is an integer number (1270080).

Almost surely, 2^13913691 is an apocalyptic number.

13913691 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13913691 is a deficient number, since it is larger than the sum of its proper divisors (6407589).

13913691 is a wasteful number, since it uses less digits than its factorization.

13913691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1746.

The product of its digits is 4374, while the sum is 33.

The square root of 13913691 is about 3730.1060306645. The cubic root of 13913691 is about 240.5179266349.

The spelling of 13913691 in words is "thirteen million, nine hundred thirteen thousand, six hundred ninety-one".