392278668 has 12 divisors (see below), whose sum is σ = 915316920. Its totient is φ = 130759552.

The previous prime is 392278661. The next prime is 392278697. The reversal of 392278668 is 866872293.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 392278668.

It is not an unprimeable number, because it can be changed into a prime (392278661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16344933 + ... + 16344956.

It is an arithmetic number, because the mean of its divisors is an integer number (76276410).

Almost surely, 2^392278668 is an apocalyptic number.

It is an amenable number.

392278668 is an abundant number, since it is smaller than the sum of its proper divisors (523038252).

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

392278668 is a wasteful number, since it uses less digits than its factorization.

392278668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32689896 (or 32689894 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 51.

The square root of 392278668 is about 19806.0260526942. The cubic root of 392278668 is about 732.0345246340.

It can be divided in two parts, 39227 and 8668, that added together give a triangular number (47895 = T₃₀₉).

The spelling of 392278668 in words is "three hundred ninety-two million, two hundred seventy-eight thousand, six hundred sixty-eight".