13997947 has 2 divisors, whose sum is σ = 13997948. Its totient is φ = 13997946.

The previous prime is 13997939. The next prime is 13997983. The reversal of 13997947 is 74979931.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13997947 - 2³ = 13997939 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13997947.

It is not a weakly prime, because it can be changed into another prime (13997917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6998973 + 6998974.

It is an arithmetic number, because the mean of its divisors is an integer number (6998974).

Almost surely, 2^13997947 is an apocalyptic number.

13997947 is a deficient number, since it is larger than the sum of its proper divisors (1).

13997947 is an equidigital number, since it uses as much as digits as its factorization.

13997947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 428652, while the sum is 49.

The square root of 13997947 is about 3741.3830330507. The cubic root of 13997947 is about 241.0024448367.

The spelling of 13997947 in words is "thirteen million, nine hundred ninety-seven thousand, nine hundred forty-seven".