12491939 has 2 divisors, whose sum is σ = 12491940. Its totient is φ = 12491938.

The previous prime is 12491933. The next prime is 12491971. The reversal of 12491939 is 93919421.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12491939 is a prime.

It is not a weakly prime, because it can be changed into another prime (12491933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6245969 + 6245970.

It is an arithmetic number, because the mean of its divisors is an integer number (6245970).

Almost surely, 2^12491939 is an apocalyptic number.

12491939 is a deficient number, since it is larger than the sum of its proper divisors (1).

12491939 is an equidigital number, since it uses as much as digits as its factorization.

12491939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17496, while the sum is 38.

The square root of 12491939 is about 3534.3937245304. The cubic root of 12491939 is about 232.0295431561.

The spelling of 12491939 in words is "twelve million, four hundred ninety-one thousand, nine hundred thirty-nine".