1392130809 has 24 divisors (see below), whose sum is σ = 2075999432. Its totient is φ = 898283520.

The previous prime is 1392130801. The next prime is 1392130823. The reversal of 1392130809 is 9080312931.

It can be written as a sum of positive squares in 4 ways, for example, as 200845584 + 1191285225 = 14172^2 + 34515^2 .

It is not a de Polignac number, because 1392130809 - 2³ = 1392130801 is a prime.

It is a super-4 number, since 4×1392130809⁴ (a number of 38 digits) contains 4444 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1392130801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53439 + ... + 75099.

Almost surely, 2^1392130809 is an apocalyptic number.

It is an amenable number.

1392130809 is a deficient number, since it is larger than the sum of its proper divisors (683868623).

1392130809 is a wasteful number, since it uses less digits than its factorization.

1392130809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21897 (or 21894 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 1392130809 is about 37311.2691957805. The cubic root of 1392130809 is about 1116.5890081683.

The spelling of 1392130809 in words is "one billion, three hundred ninety-two million, one hundred thirty thousand, eight hundred nine".