12645731 has 4 divisors (see below), whose sum is σ = 14452272. Its totient is φ = 10839192.

The previous prime is 12645713. The next prime is 12645733. The reversal of 12645731 is 13754621.

12645731 is digitally balanced in base 2, base 3 and base 8, because in such bases 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 12645731 - 2⁶ = 12645667 is a prime.

It is a super-2 number, since 2×12645731² = 319829025048722, which contains 22 as substring.

It is a Duffinian number.

12645731 is strictly pandigital in base 8.

It is a junction number, because it is equal to n+sod(n) for n = 12645694 and 12645703.

It is not an unprimeable number, because it can be changed into a prime (12645733) 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, 903260 + ... + 903273.

It is an arithmetic number, because the mean of its divisors is an integer number (3613068).

Almost surely, 2^12645731 is an apocalyptic number.

12645731 is a deficient number, since it is larger than the sum of its proper divisors (1806541).

12645731 is an equidigital number, since it uses as much as digits as its factorization.

12645731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1806540.

The product of its digits is 5040, while the sum is 29.

The square root of 12645731 is about 3556.0836604332. The cubic root of 12645731 is about 232.9778571306.

The spelling of 12645731 in words is "twelve million, six hundred forty-five thousand, seven hundred thirty-one".