12491338 has 4 divisors (see below), whose sum is σ = 18737010. Its totient is φ = 6245668.

The previous prime is 12491333. The next prime is 12491351. The reversal of 12491338 is 83319421.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 83319421 = 41 ⋅2032181.

It can be written as a sum of positive squares in only one way, i.e., 11309769 + 1181569 = 3363^2 + 1087^2 .

It is a super-4 number, since 4×12491338⁴ (a number of 29 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (12491333) 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, 3122833 + ... + 3122836.

Almost surely, 2^12491338 is an apocalyptic number.

12491338 is a deficient number, since it is larger than the sum of its proper divisors (6245672).

12491338 is an equidigital number, since it uses as much as digits as its factorization.

12491338 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6245671.

The product of its digits is 5184, while the sum is 31.

The square root of 12491338 is about 3534.3087018539. The cubic root of 12491338 is about 232.0258220367.

The spelling of 12491338 in words is "twelve million, four hundred ninety-one thousand, three hundred thirty-eight".