13999969 has 2 divisors, whose sum is σ = 13999970. Its totient is φ = 13999968.

The previous prime is 13999961. The next prime is 13999981. The reversal of 13999969 is 96999931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12006225 + 1993744 = 3465^2 + 1412^2 .

It is a cyclic number.

It is not a de Polignac number, because 13999969 - 2³ = 13999961 is a prime.

It is a super-2 number, since 2×13999969² = 391998264001922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (13999961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6999984 + 6999985.

It is an arithmetic number, because the mean of its divisors is an integer number (6999985).

Almost surely, 2^13999969 is an apocalyptic number.

It is an amenable number.

13999969 is a deficient number, since it is larger than the sum of its proper divisors (1).

13999969 is an equidigital number, since it uses as much as digits as its factorization.

13999969 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1062882, while the sum is 55.

The square root of 13999969 is about 3741.6532442224. The cubic root of 13999969 is about 241.0140485259.

The spelling of 13999969 in words is "thirteen million, nine hundred ninety-nine thousand, nine hundred sixty-nine".