12431721 has 8 divisors (see below), whose sum is σ = 16635744. Its totient is φ = 8257760.

The previous prime is 12431711. The next prime is 12431759. The reversal of 12431721 is 12713421.

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

It is a cyclic number.

It is not a de Polignac number, because 12431721 - 2⁵ = 12431689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12431701) 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, 6531 + ... + 8216.

It is an arithmetic number, because the mean of its divisors is an integer number (2079468).

Almost surely, 2^12431721 is an apocalyptic number.

It is an amenable number.

12431721 is a deficient number, since it is larger than the sum of its proper divisors (4204023).

12431721 is a wasteful number, since it uses less digits than its factorization.

12431721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15031.

The product of its digits is 336, while the sum is 21.

The square root of 12431721 is about 3525.8645748242. The cubic root of 12431721 is about 231.6561058853.

The spelling of 12431721 in words is "twelve million, four hundred thirty-one thousand, seven hundred twenty-one".