12307921 has 8 divisors (see below), whose sum is σ = 13025664. Its totient is φ = 11605440.

The previous prime is 12307903. The next prime is 12307927. The reversal of 12307921 is 12970321.

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 12307921 - 2⁷ = 12307793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12307927) 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, 2136 + ... + 5401.

It is an arithmetic number, because the mean of its divisors is an integer number (1628208).

Almost surely, 2^12307921 is an apocalyptic number.

It is an amenable number.

12307921 is a deficient number, since it is larger than the sum of its proper divisors (717743).

12307921 is an equidigital number, since it uses as much as digits as its factorization.

12307921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7631.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 12307921 is about 3508.2646707454. The cubic root of 12307921 is about 230.8845646764.

The spelling of 12307921 in words is "twelve million, three hundred seven thousand, nine hundred twenty-one".