12547399 has 2 divisors, whose sum is σ = 12547400. Its totient is φ = 12547398.

The previous prime is 12547361. The next prime is 12547417. The reversal of 12547399 is 99374521.

It is a strong prime.

It is an emirp because it is prime and its reverse (99374521) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12547399 - 2⁹ = 12546887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12547319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6273699 + 6273700.

It is an arithmetic number, because the mean of its divisors is an integer number (6273700).

Almost surely, 2^12547399 is an apocalyptic number.

12547399 is a deficient number, since it is larger than the sum of its proper divisors (1).

12547399 is an equidigital number, since it uses as much as digits as its factorization.

12547399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 68040, while the sum is 40.

The square root of 12547399 is about 3542.2307942877. The cubic root of 12547399 is about 232.3724139085.

It can be divided in two parts, 125 and 47399, that added together give a square (47524 = 218²).

The spelling of 12547399 in words is "twelve million, five hundred forty-seven thousand, three hundred ninety-nine".