394294640 has 40 divisors (see below), whose sum is σ = 932284080. Its totient is φ = 155042816.

The previous prime is 394294619. The next prime is 394294657. The reversal of 394294640 is 46492493.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 37049 + ... + 46488.

It is an arithmetic number, because the mean of its divisors is an integer number (23307102).

Almost surely, 2^394294640 is an apocalyptic number.

It is an amenable number.

394294640 is an abundant number, since it is smaller than the sum of its proper divisors (537989440).

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

394294640 is a wasteful number, since it uses less digits than its factorization.

394294640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83609 (or 83603 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 41.

The square root of 394294640 is about 19856.8537286248. The cubic root of 394294640 is about 733.2863900162.

The spelling of 394294640 in words is "three hundred ninety-four million, two hundred ninety-four thousand, six hundred forty".