1392511979 has 4 divisors (see below), whose sum is σ = 1395728376. Its totient is φ = 1389295584.

The previous prime is 1392511969. The next prime is 1392511997. The reversal of 1392511979 is 9791152931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9791152931 = 7 ⋅1398736133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1392511979 is a prime.

It is a super-2 number, since 2×1392511979² = 3878179223316992882, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1392511949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1607549 + ... + 1608414.

It is an arithmetic number, because the mean of its divisors is an integer number (348932094).

Almost surely, 2^1392511979 is an apocalyptic number.

1392511979 is a deficient number, since it is larger than the sum of its proper divisors (3216397).

1392511979 is an equidigital number, since it uses as much as digits as its factorization.

1392511979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216396.

The product of its digits is 153090, while the sum is 47.

The square root of 1392511979 is about 37316.3768203720. The cubic root of 1392511979 is about 1116.6909074513.

The spelling of 1392511979 in words is "one billion, three hundred ninety-two million, five hundred eleven thousand, nine hundred seventy-nine".