392978790 has 80 divisors (see below), whose sum is σ = 1066610160. Its totient is φ = 103809600.

The previous prime is 392978777. The next prime is 392978791. The reversal of 392978790 is 97879293.

392978790 is a `hidden beast` number, since 392 + 97 + 87 + 90 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (392978791) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 86065 + ... + 90515.

It is an arithmetic number, because the mean of its divisors is an integer number (13332627).

Almost surely, 2^392978790 is an apocalyptic number.

392978790 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 392978790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (533305080).

392978790 is an abundant number, since it is smaller than the sum of its proper divisors (673631370).

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

392978790 is a wasteful number, since it uses less digits than its factorization.

392978790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4579 (or 4570 counting only the distinct ones).

The product of its (nonzero) digits is 1714608, while the sum is 54.

The square root of 392978790 is about 19823.6926428958. The cubic root of 392978790 is about 732.4697669887.

The spelling of 392978790 in words is "three hundred ninety-two million, nine hundred seventy-eight thousand, seven hundred ninety".