12720331 has 8 divisors (see below), whose sum is σ = 13865040. Its totient is φ = 11599392.

The previous prime is 12720317. The next prime is 12720347. The reversal of 12720331 is 13302721.

12720331 is nontrivially palindromic in base 14.

12720331 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12720331 is a prime.

It is a super-2 number, since 2×12720331² = 323613641499122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12720299 and 12720308.

It is not an unprimeable number, because it can be changed into a prime (12720361) 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, 4816 + ... + 6973.

It is an arithmetic number, because the mean of its divisors is an integer number (1733130).

Almost surely, 2^12720331 is an apocalyptic number.

12720331 is a deficient number, since it is larger than the sum of its proper divisors (1144709).

12720331 is a wasteful number, since it uses less digits than its factorization.

12720331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11885.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 12720331 is about 3566.5573036193. The cubic root of 12720331 is about 233.4350887252.

The spelling of 12720331 in words is "twelve million, seven hundred twenty thousand, three hundred thirty-one".