1312403239 has 4 divisors (see below), whose sum is σ = 1499889424. Its totient is φ = 1124917056.

The previous prime is 1312403201. The next prime is 1312403243. The reversal of 1312403239 is 9323042131.

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 1312403239 - 2⁹ = 1312402727 is a prime.

It is a super-2 number, since 2×1312403239² = 3444804523475382242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1312403249) 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, 93743082 + ... + 93743095.

It is an arithmetic number, because the mean of its divisors is an integer number (374972356).

Almost surely, 2^1312403239 is an apocalyptic number.

1312403239 is a deficient number, since it is larger than the sum of its proper divisors (187486185).

1312403239 is an equidigital number, since it uses as much as digits as its factorization.

1312403239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 187486184.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 1312403239 is about 36227.1064121881. The cubic root of 1312403239 is about 1094.8528784916.

The spelling of 1312403239 in words is "one billion, three hundred twelve million, four hundred three thousand, two hundred thirty-nine".