13899917 has 2 divisors, whose sum is σ = 13899918. Its totient is φ = 13899916.

The previous prime is 13899881. The next prime is 13899929. The reversal of 13899917 is 71999831.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12033961 + 1865956 = 3469^2 + 1366^2 .

It is a cyclic number.

It is not a de Polignac number, because 13899917 - 2⁸ = 13899661 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13899947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6949958 + 6949959.

It is an arithmetic number, because the mean of its divisors is an integer number (6949959).

Almost surely, 2^13899917 is an apocalyptic number.

It is an amenable number.

13899917 is a deficient number, since it is larger than the sum of its proper divisors (1).

13899917 is an equidigital number, since it uses as much as digits as its factorization.

13899917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 47.

The square root of 13899917 is about 3728.2592452779. The cubic root of 13899917 is about 240.4385327071.

The spelling of 13899917 in words is "thirteen million, eight hundred ninety-nine thousand, nine hundred seventeen".