394478985 has 32 divisors (see below), whose sum is σ = 639240192. Its totient is φ = 207717120.

The previous prime is 394478983. The next prime is 394479023. The reversal of 394478985 is 589874493.

It is not a de Polignac number, because 394478985 - 2¹ = 394478983 is a prime.

It is a super-2 number, since 2×394478985² = 311227339213260450, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (394478983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 449367 + ... + 450243.

It is an arithmetic number, because the mean of its divisors is an integer number (19976256).

Almost surely, 2^394478985 is an apocalyptic number.

It is an amenable number.

394478985 is a deficient number, since it is larger than the sum of its proper divisors (244761207).

394478985 is a wasteful number, since it uses less digits than its factorization.

394478985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1233.

The product of its digits is 8709120, while the sum is 57.

The square root of 394478985 is about 19861.4950343623. The cubic root of 394478985 is about 733.4006502713.

The spelling of 394478985 in words is "three hundred ninety-four million, four hundred seventy-eight thousand, nine hundred eighty-five".