13890257 has 2 divisors, whose sum is σ = 13890258. Its totient is φ = 13890256.

The previous prime is 13890223. The next prime is 13890259. The reversal of 13890257 is 75209831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13535041 + 355216 = 3679^2 + 596^2 .

It is a cyclic number.

It is not a de Polignac number, because 13890257 - 2²² = 9695953 is a prime.

Together with 13890259, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13890259) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6945128 + 6945129.

It is an arithmetic number, because the mean of its divisors is an integer number (6945129).

Almost surely, 2^13890257 is an apocalyptic number.

It is an amenable number.

13890257 is a deficient number, since it is larger than the sum of its proper divisors (1).

13890257 is an equidigital number, since it uses as much as digits as its factorization.

13890257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 13890257 is about 3726.9635093464. The cubic root of 13890257 is about 240.3828207561.

The spelling of 13890257 in words is "thirteen million, eight hundred ninety thousand, two hundred fifty-seven".