1392776988 has 36 divisors (see below), whose sum is σ = 3429868680. Its totient is φ = 439822944.

The previous prime is 1392776981. The next prime is 1392776993. The reversal of 1392776988 is 8896772931.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1392776981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156423 + ... + 165086.

It is an arithmetic number, because the mean of its divisors is an integer number (95274130).

Almost surely, 2^1392776988 is an apocalyptic number.

It is an amenable number.

1392776988 is an abundant number, since it is smaller than the sum of its proper divisors (2037091692).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1392776988 is a wasteful number, since it uses less digits than its factorization.

1392776988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 321554 (or 321533 counting only the distinct ones).

The product of its digits is 9144576, while the sum is 60.

The square root of 1392776988 is about 37319.9274918910. The cubic root of 1392776988 is about 1116.7617421189.

The spelling of 1392776988 in words is "one billion, three hundred ninety-two million, seven hundred seventy-six thousand, nine hundred eighty-eight".