390938680 has 128 divisors (see below), whose sum is σ = 1022284800. Its totient is φ = 133056000.

The previous prime is 390938629. The next prime is 390938701. The reversal of 390938680 is 86839093.

It is a self number, because there is not a number n which added to its sum of digits gives 390938680.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 844129 + ... + 844591.

It is an arithmetic number, because the mean of its divisors is an integer number (7986600).

Almost surely, 2^390938680 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 390938680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (511142400).

390938680 is an abundant number, since it is smaller than the sum of its proper divisors (631346120).

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

390938680 is a wasteful number, since it uses less digits than its factorization.

390938680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 605 (or 601 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 46.

The square root of 390938680 is about 19772.1693296411. The cubic root of 390938680 is about 731.2000527893.

The spelling of 390938680 in words is "three hundred ninety million, nine hundred thirty-eight thousand, six hundred eighty".