12538731 has 4 divisors (see below), whose sum is σ = 16718312. Its totient is φ = 8359152.

The previous prime is 12538723. The next prime is 12538753. The reversal of 12538731 is 13783521.

12538731 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12538731 - 2³ = 12538723 is a prime.

It is a super-2 number, since 2×12538731² = 314439550180722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12538831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2089786 + ... + 2089791.

It is an arithmetic number, because the mean of its divisors is an integer number (4179578).

Almost surely, 2^12538731 is an apocalyptic number.

12538731 is a deficient number, since it is larger than the sum of its proper divisors (4179581).

12538731 is an equidigital number, since it uses as much as digits as its factorization.

12538731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4179580.

The product of its digits is 5040, while the sum is 30.

The square root of 12538731 is about 3541.0070601455. The cubic root of 12538731 is about 232.3188923758.

The spelling of 12538731 in words is "twelve million, five hundred thirty-eight thousand, seven hundred thirty-one".