12965721 has 8 divisors (see below), whose sum is σ = 18039360. Its totient is φ = 8267952.

The previous prime is 12965707. The next prime is 12965723. The reversal of 12965721 is 12756921.

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

It is not a de Polignac number, because 12965721 - 2⁷ = 12965593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12965723) 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, 93886 + ... + 94023.

It is an arithmetic number, because the mean of its divisors is an integer number (2254920).

Almost surely, 2^12965721 is an apocalyptic number.

It is an amenable number.

12965721 is a deficient number, since it is larger than the sum of its proper divisors (5073639).

12965721 is a wasteful number, since it uses less digits than its factorization.

12965721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187935.

The product of its digits is 7560, while the sum is 33.

The square root of 12965721 is about 3600.7944956634. The cubic root of 12965721 is about 234.9266165920.

The spelling of 12965721 in words is "twelve million, nine hundred sixty-five thousand, seven hundred twenty-one".