394042656 has 96 divisors (see below), whose sum is σ = 1185988608. Its totient is φ = 112216320.

The previous prime is 394042631. The next prime is 394042667. The reversal of 394042656 is 656240493.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×394042656² = 310539229495068672, which contains 22 as substring.

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, 256611 + ... + 258141.

It is an arithmetic number, because the mean of its divisors is an integer number (12354048).

Almost surely, 2^394042656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 394042656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (592994304).

394042656 is an abundant number, since it is smaller than the sum of its proper divisors (791945952).

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

394042656 is a wasteful number, since it uses less digits than its factorization.

394042656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1934 (or 1926 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 39.

The square root of 394042656 is about 19850.5077013159. The cubic root of 394042656 is about 733.1301483000.

The spelling of 394042656 in words is "three hundred ninety-four million, forty-two thousand, six hundred fifty-six".