394382690 has 64 divisors (see below), whose sum is σ = 796636512. Its totient is φ = 139622400.

The previous prime is 394382689. The next prime is 394382701. The reversal of 394382690 is 96283493.

It can be written as a sum of positive squares in 16 ways, for example, as 182709289 + 211673401 = 13517^2 + 14549^2 .

It is a super-2 number, since 2×394382690² = 311075412343272200, which contains 22 as substring.

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, 324524 + ... + 325736.

Almost surely, 2^394382690 is an apocalyptic number.

394382690 is an abundant number, since it is smaller than the sum of its proper divisors (402253822).

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

394382690 is a wasteful number, since it uses less digits than its factorization.

394382690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 394382690 is about 19859.0707234755. The cubic root of 394382690 is about 733.3409693879.

The spelling of 394382690 in words is "three hundred ninety-four million, three hundred eighty-two thousand, six hundred ninety".