394664644 has 48 divisors (see below), whose sum is σ = 779486400. Its totient is φ = 173266560.

The previous prime is 394664609. The next prime is 394664651. The reversal of 394664644 is 446466493.

It is a happy number.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 394664594 and 394664603.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 241759 + ... + 243385.

It is an arithmetic number, because the mean of its divisors is an integer number (16239300).

Almost surely, 2^394664644 is an apocalyptic number.

It is an amenable number.

394664644 is a deficient number, since it is larger than the sum of its proper divisors (384821756).

394664644 is a wasteful number, since it uses less digits than its factorization.

394664644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1828 (or 1826 counting only the distinct ones).

The product of its digits is 1492992, while the sum is 46.

The square root of 394664644 is about 19866.1683270831. The cubic root of 394664644 is about 733.5156889939.

The spelling of 394664644 in words is "three hundred ninety-four million, six hundred sixty-four thousand, six hundred forty-four".