13991347 has 2 divisors, whose sum is σ = 13991348. Its totient is φ = 13991346.

The previous prime is 13991333. The next prime is 13991363. The reversal of 13991347 is 74319931.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13991347 is a prime.

It is not a weakly prime, because it can be changed into another prime (13991147) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6995673 + 6995674.

It is an arithmetic number, because the mean of its divisors is an integer number (6995674).

Almost surely, 2^13991347 is an apocalyptic number.

13991347 is a deficient number, since it is larger than the sum of its proper divisors (1).

13991347 is an equidigital number, since it uses as much as digits as its factorization.

13991347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 37.

The square root of 13991347 is about 3740.5009022857. The cubic root of 13991347 is about 240.9645615149.

The spelling of 13991347 in words is "thirteen million, nine hundred ninety-one thousand, three hundred forty-seven".