13872917 has 2 divisors, whose sum is σ = 13872918. Its totient is φ = 13872916.

The previous prime is 13872899. The next prime is 13872919. The reversal of 13872917 is 71927831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13608721 + 264196 = 3689^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 13872917 - 2⁶ = 13872853 is a prime.

Together with 13872919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13872919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6936458 + 6936459.

It is an arithmetic number, because the mean of its divisors is an integer number (6936459).

Almost surely, 2^13872917 is an apocalyptic number.

It is an amenable number.

13872917 is a deficient number, since it is larger than the sum of its proper divisors (1).

13872917 is an equidigital number, since it uses as much as digits as its factorization.

13872917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21168, while the sum is 38.

The square root of 13872917 is about 3724.6364923305. The cubic root of 13872917 is about 240.2827512422.

The spelling of 13872917 in words is "thirteen million, eight hundred seventy-two thousand, nine hundred seventeen".