12720322 has 4 divisors (see below), whose sum is σ = 19080486. Its totient is φ = 6360160.

The previous prime is 12720317. The next prime is 12720347. The reversal of 12720322 is 22302721.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22302721 = 7 ⋅3186103.

It can be written as a sum of positive squares in only one way, i.e., 12680721 + 39601 = 3561^2 + 199^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12720322.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3180079 + ... + 3180082.

Almost surely, 2^12720322 is an apocalyptic number.

12720322 is a deficient number, since it is larger than the sum of its proper divisors (6360164).

12720322 is an equidigital number, since it uses as much as digits as its factorization.

12720322 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6360163.

The product of its (nonzero) digits is 336, while the sum is 19.

The square root of 12720322 is about 3566.5560418981. The cubic root of 12720322 is about 233.4350336711.

It can be divided in two parts, 127 and 20322, that added together give a square (20449 = 143²).

The spelling of 12720322 in words is "twelve million, seven hundred twenty thousand, three hundred twenty-two".