390681855 has 24 divisors (see below), whose sum is σ = 677785680. Its totient is φ = 208177920.

The previous prime is 390681821. The next prime is 390681859. The reversal of 390681855 is 558186093.

It is not a de Polignac number, because 390681855 - 2⁷ = 390681727 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 390681855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (390681859) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 58056 + ... + 64434.

It is an arithmetic number, because the mean of its divisors is an integer number (28241070).

Almost surely, 2^390681855 is an apocalyptic number.

390681855 is a deficient number, since it is larger than the sum of its proper divisors (287103825).

390681855 is a wasteful number, since it uses less digits than its factorization.

390681855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7751 (or 7748 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 390681855 is about 19765.6736540903. The cubic root of 390681855 is about 731.0398984388.

The spelling of 390681855 in words is "three hundred ninety million, six hundred eighty-one thousand, eight hundred fifty-five".