1392756388 has 12 divisors (see below), whose sum is σ = 2496770892. Its totient is φ = 679393280.

The previous prime is 1392756383. The next prime is 1392756389. The reversal of 1392756388 is 8836572931.

It can be written as a sum of positive squares in 2 ways, for example, as 785232484 + 607523904 = 28022^2 + 24648^2 .

It is not an unprimeable number, because it can be changed into a prime (1392756383) 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, 4246045 + ... + 4246372.

It is an arithmetic number, because the mean of its divisors is an integer number (208064241).

Almost surely, 2^1392756388 is an apocalyptic number.

It is an amenable number.

1392756388 is a deficient number, since it is larger than the sum of its proper divisors (1104014504).

1392756388 is a wasteful number, since it uses less digits than its factorization.

1392756388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8492462 (or 8492460 counting only the distinct ones).

The product of its digits is 2177280, while the sum is 52.

The square root of 1392756388 is about 37319.6514989087. The cubic root of 1392756388 is about 1116.7562362350.

The spelling of 1392756388 in words is "one billion, three hundred ninety-two million, seven hundred fifty-six thousand, three hundred eighty-eight".