1392391880 has 64 divisors (see below), whose sum is σ = 3422882880. Its totient is φ = 505555200.

The previous prime is 1392391879. The next prime is 1392391883. The reversal of 1392391880 is 881932931.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (1392391883) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 344270 + ... + 348290.

It is an arithmetic number, because the mean of its divisors is an integer number (53482545).

Almost surely, 2^1392391880 is an apocalyptic number.

1392391880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1392391880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1711441440).

1392391880 is an abundant number, since it is smaller than the sum of its proper divisors (2030491000).

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

1392391880 is a wasteful number, since it uses less digits than its factorization.

1392391880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4830 (or 4826 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 1392391880 is about 37314.7675860376. The cubic root of 1392391880 is about 1116.6588030436.

The spelling of 1392391880 in words is "one billion, three hundred ninety-two million, three hundred ninety-one thousand, eight hundred eighty".