394334640 has 120 divisors (see below), whose sum is σ = 1513513248. Its totient is φ = 90132480.

The previous prime is 394334623. The next prime is 394334651. The reversal of 394334640 is 46433493.

It is a happy number.

394334640 is a `hidden beast` number, since 3 + 9 + 4 + 3 + 3 + 4 + 640 = 666.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 394334595 and 394334604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34081 + ... + 44160.

Almost surely, 2^394334640 is an apocalyptic number.

394334640 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

394334640 is an abundant number, since it is smaller than the sum of its proper divisors (1119178608).

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

394334640 is a wasteful number, since it uses less digits than its factorization.

394334640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78267 (or 78258 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 36.

The square root of 394334640 is about 19857.8609119915. The cubic root of 394334640 is about 733.3111857407.

It can be divided in two parts, 3943 and 34640, that added together give a palindrome (38583).

The spelling of 394334640 in words is "three hundred ninety-four million, three hundred thirty-four thousand, six hundred forty".