12724438 has 4 divisors (see below), whose sum is σ = 19086660. Its totient is φ = 6362218.

The previous prime is 12724429. The next prime is 12724441. The reversal of 12724438 is 83442721.

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

It is a super-2 number, since 2×12724438² = 323822644831688, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3181108 + ... + 3181111.

It is an arithmetic number, because the mean of its divisors is an integer number (4771665).

Almost surely, 2^12724438 is an apocalyptic number.

12724438 is a deficient number, since it is larger than the sum of its proper divisors (6362222).

12724438 is an equidigital number, since it uses as much as digits as its factorization.

12724438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6362221.

The product of its digits is 10752, while the sum is 31.

The square root of 12724438 is about 3567.1330224706. The cubic root of 12724438 is about 233.4602090030.

The spelling of 12724438 in words is "twelve million, seven hundred twenty-four thousand, four hundred thirty-eight".