12542639 has 2 divisors, whose sum is σ = 12542640. Its totient is φ = 12542638.

The previous prime is 12542611. The next prime is 12542653. The reversal of 12542639 is 93624521.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12542639 - 2¹² = 12538543 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12542539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6271319 + 6271320.

It is an arithmetic number, because the mean of its divisors is an integer number (6271320).

Almost surely, 2^12542639 is an apocalyptic number.

12542639 is a deficient number, since it is larger than the sum of its proper divisors (1).

12542639 is an equidigital number, since it uses as much as digits as its factorization.

12542639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12960, while the sum is 32.

The square root of 12542639 is about 3541.5588375742. The cubic root of 12542639 is about 232.3430258101.

The spelling of 12542639 in words is "twelve million, five hundred forty-two thousand, six hundred thirty-nine".