12320639 has 4 divisors (see below), whose sum is σ = 12329520. Its totient is φ = 12311760.

The previous prime is 12320599. The next prime is 12320647. The reversal of 12320639 is 93602321.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12320639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12320669) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1859 + ... + 5300.

It is an arithmetic number, because the mean of its divisors is an integer number (3082380).

Almost surely, 2^12320639 is an apocalyptic number.

12320639 is a deficient number, since it is larger than the sum of its proper divisors (8881).

12320639 is an equidigital number, since it uses as much as digits as its factorization.

12320639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8880.

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 12320639 is about 3510.0767797870. The cubic root of 12320639 is about 230.9640630489.

The spelling of 12320639 in words is "twelve million, three hundred twenty thousand, six hundred thirty-nine".