12491938 has 4 divisors (see below), whose sum is σ = 18737910. Its totient is φ = 6245968.

The previous prime is 12491933. The next prime is 12491939. The reversal of 12491938 is 83919421.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 8277129 + 4214809 = 2877^2 + 2053^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12491897 and 12491906.

It is not an unprimeable number, because it can be changed into a prime (12491933) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3122983 + ... + 3122986.

Almost surely, 2^12491938 is an apocalyptic number.

12491938 is a deficient number, since it is larger than the sum of its proper divisors (6245972).

12491938 is an equidigital number, since it uses as much as digits as its factorization.

12491938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6245971.

The product of its digits is 15552, while the sum is 37.

The square root of 12491938 is about 3534.3935830634. The cubic root of 12491938 is about 232.0295369647.

The spelling of 12491938 in words is "twelve million, four hundred ninety-one thousand, nine hundred thirty-eight".