12506399 has 2 divisors, whose sum is σ = 12506400. Its totient is φ = 12506398.

The previous prime is 12506393. The next prime is 12506401. The reversal of 12506399 is 99360521.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 12506399 - 2⁴ = 12506383 is a prime.

Together with 12506401, 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 (12506393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6253199 + 6253200.

It is an arithmetic number, because the mean of its divisors is an integer number (6253200).

Almost surely, 2^12506399 is an apocalyptic number.

12506399 is a deficient number, since it is larger than the sum of its proper divisors (1).

12506399 is an equidigital number, since it uses as much as digits as its factorization.

12506399 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14580, while the sum is 35.

The square root of 12506399 is about 3536.4387454048. The cubic root of 12506399 is about 232.1190369608.

It can be divided in two parts, 12506 and 399, that multiplied together give a palindrome (4989894).

The spelling of 12506399 in words is "twelve million, five hundred six thousand, three hundred ninety-nine".