12538391 has 2 divisors, whose sum is σ = 12538392. Its totient is φ = 12538390.

The previous prime is 12538363. The next prime is 12538397. The reversal of 12538391 is 19383521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12538391 - 2²² = 8344087 is a prime.

It is a super-2 number, since 2×12538391² = 314422497737762, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12538397) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6269195 + 6269196.

It is an arithmetic number, because the mean of its divisors is an integer number (6269196).

Almost surely, 2^12538391 is an apocalyptic number.

12538391 is a deficient number, since it is larger than the sum of its proper divisors (1).

12538391 is an equidigital number, since it uses as much as digits as its factorization.

12538391 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6480, while the sum is 32.

The square root of 12538391 is about 3540.9590508787. The cubic root of 12538391 is about 232.3167925052.

The spelling of 12538391 in words is "twelve million, five hundred thirty-eight thousand, three hundred ninety-one".