392121392 has 80 divisors (see below), whose sum is σ = 866715360. Its totient is φ = 170366976.

The previous prime is 392121391. The next prime is 392121403. The reversal of 392121392 is 293121293.

It is not an unprimeable number, because it can be changed into a prime (392121391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1236818 + ... + 1237134.

It is an arithmetic number, because the mean of its divisors is an integer number (10833942).

Almost surely, 2^392121392 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 392121392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (433357680).

392121392 is an abundant number, since it is smaller than the sum of its proper divisors (474593968).

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

392121392 is a wasteful number, since it uses less digits than its factorization.

392121392 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 670 (or 664 counting only the distinct ones).

The product of its digits is 5832, while the sum is 32.

The square root of 392121392 is about 19802.0552468677. The cubic root of 392121392 is about 731.9366802007.

Subtracting from 392121392 its reverse (293121293), we obtain a palindrome (99000099).

It can be divided in two parts, 39212 and 1392, that added together give a palindrome (40604).

The spelling of 392121392 in words is "three hundred ninety-two million, one hundred twenty-one thousand, three hundred ninety-two".