394664645 has 16 divisors (see below), whose sum is σ = 486197760. Its totient is φ = 307442304.

The previous prime is 394664609. The next prime is 394664651. The reversal of 394664645 is 546466493.

It is a cyclic number.

It is not a de Polignac number, because 394664645 - 2¹² = 394660549 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 394664645.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21992 + ... + 35678.

It is an arithmetic number, because the mean of its divisors is an integer number (30387360).

Almost surely, 2^394664645 is an apocalyptic number.

It is an amenable number.

394664645 is a deficient number, since it is larger than the sum of its proper divisors (91533115).

394664645 is a wasteful number, since it uses less digits than its factorization.

394664645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13844.

The product of its digits is 1866240, while the sum is 47.

The square root of 394664645 is about 19866.1683522515. The cubic root of 394664645 is about 733.5156896134.

The spelling of 394664645 in words is "three hundred ninety-four million, six hundred sixty-four thousand, six hundred forty-five".