1239874813 has 4 divisors (see below), whose sum is σ = 1240250368. Its totient is φ = 1239499260.

The previous prime is 1239874799. The next prime is 1239874817. The reversal of 1239874813 is 3184789321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1239874813 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 (1239874817) 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, 182781 + ... + 189442.

It is an arithmetic number, because the mean of its divisors is an integer number (310062592).

Almost surely, 2^1239874813 is an apocalyptic number.

It is an amenable number.

1239874813 is a deficient number, since it is larger than the sum of its proper divisors (375555).

1239874813 is an equidigital number, since it uses as much as digits as its factorization.

1239874813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375554.

The product of its digits is 290304, while the sum is 46.

The square root of 1239874813 is about 35211.8561424984. The cubic root of 1239874813 is about 1074.3009157306.

The spelling of 1239874813 in words is "one billion, two hundred thirty-nine million, eight hundred seventy-four thousand, eight hundred thirteen".