12642731 has 8 divisors (see below), whose sum is σ = 12996720. Its totient is φ = 12291552.

The previous prime is 12642703. The next prime is 12642743. The reversal of 12642731 is 13724621.

12642731 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12642731 is a prime.

It is a super-2 number, since 2×12642731² = 319677294276722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 12642731.

It is not an unprimeable number, because it can be changed into a prime (12642701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11021 + ... + 12113.

It is an arithmetic number, because the mean of its divisors is an integer number (1624590).

Almost surely, 2^12642731 is an apocalyptic number.

12642731 is a deficient number, since it is larger than the sum of its proper divisors (353989).

12642731 is a wasteful number, since it uses less digits than its factorization.

12642731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405.

The product of its digits is 2016, while the sum is 26.

The square root of 12642731 is about 3555.6618230647. The cubic root of 12642731 is about 232.9594322342.

The spelling of 12642731 in words is "twelve million, six hundred forty-two thousand, seven hundred thirty-one".