1392397972 has 24 divisors (see below), whose sum is σ = 2785818560. Its totient is φ = 596522880.

The previous prime is 1392397961. The next prime is 1392398009. The reversal of 1392397972 is 2797932931.

It is a happy number.

It is a super-2 number, since 2×1392397972² = 3877544224859425568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85804 + ... + 100732.

Almost surely, 2^1392397972 is an apocalyptic number.

It is an amenable number.

1392397972 is an abundant number, since it is smaller than the sum of its proper divisors (1393420588).

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

1392397972 is a wasteful number, since it uses less digits than its factorization.

1392397972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18271 (or 18269 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 52.

The square root of 1392397972 is about 37314.8492158283. The cubic root of 1392397972 is about 1116.6604315783.

The spelling of 1392397972 in words is "one billion, three hundred ninety-two million, three hundred ninety-seven thousand, nine hundred seventy-two".