1392399944 has 48 divisors (see below), whose sum is σ = 2939250300. Its totient is φ = 614680704.

The previous prime is 1392399929. The next prime is 1392399959. The reversal of 1392399944 is 4499932931.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1392399929) and next prime (1392399959).

It can be written as a sum of positive squares in 2 ways, for example, as 1364415844 + 27984100 = 36938^2 + 5290^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42362 + ... + 67670.

Almost surely, 2^1392399944 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1392399944, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1469625150).

1392399944 is an abundant number, since it is smaller than the sum of its proper divisors (1546850356).

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

1392399944 is a wasteful number, since it uses less digits than its factorization.

1392399944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25374 (or 25347 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 53.

The square root of 1392399944 is about 37314.8756396159. The cubic root of 1392399944 is about 1116.6609587392.

The spelling of 1392399944 in words is "one billion, three hundred ninety-two million, three hundred ninety-nine thousand, nine hundred forty-four".