12499721 has 16 divisors (see below), whose sum is σ = 13891584. Its totient is φ = 11176704.

The previous prime is 12499699. The next prime is 12499733. The reversal of 12499721 is 12799421.

It is a cyclic number.

It is not a de Polignac number, because 12499721 - 2⁶ = 12499657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12499021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98360 + ... + 98486.

It is an arithmetic number, because the mean of its divisors is an integer number (868224).

Almost surely, 2^12499721 is an apocalyptic number.

It is an amenable number.

12499721 is a deficient number, since it is larger than the sum of its proper divisors (1391863).

12499721 is a wasteful number, since it uses less digits than its factorization.

12499721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 320.

The product of its digits is 9072, while the sum is 35.

The square root of 12499721 is about 3535.4944491542. The cubic root of 12499721 is about 232.0777149967.

The spelling of 12499721 in words is "twelve million, four hundred ninety-nine thousand, seven hundred twenty-one".