1392320639 has 4 divisors (see below), whose sum is σ = 1437234240. Its totient is φ = 1347407040.

The previous prime is 1392320609. The next prime is 1392320641. The reversal of 1392320639 is 9360232931.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1392320639 - 2¹² = 1392316543 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 (1392320609) 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, 22456754 + ... + 22456815.

It is an arithmetic number, because the mean of its divisors is an integer number (359308560).

Almost surely, 2^1392320639 is an apocalyptic number.

1392320639 is a deficient number, since it is larger than the sum of its proper divisors (44913601).

1392320639 is an equidigital number, since it uses as much as digits as its factorization.

1392320639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44913600.

The product of its (nonzero) digits is 52488, while the sum is 38.

The square root of 1392320639 is about 37313.8129785740. The cubic root of 1392320639 is about 1116.6397582982.

The spelling of 1392320639 in words is "one billion, three hundred ninety-two million, three hundred twenty thousand, six hundred thirty-nine".