394817856 has 28 divisors (see below), whose sum is σ = 1044622752. Its totient is φ = 131605888.

The previous prime is 394817851. The next prime is 394817867. The reversal of 394817856 is 658718493.

It is a super-2 number, since 2×394817856² = 311762278832873472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 394817799 and 394817808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394817851) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1027980 + ... + 1028363.

Almost surely, 2^394817856 is an apocalyptic number.

It is an amenable number.

394817856 is an abundant number, since it is smaller than the sum of its proper divisors (649804896).

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

394817856 is a wasteful number, since it uses less digits than its factorization.

394817856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2056358 (or 2056348 counting only the distinct ones).

The product of its digits is 1451520, while the sum is 51.

The square root of 394817856 is about 19870.0240563518. The cubic root of 394817856 is about 733.6105956172.

The spelling of 394817856 in words is "three hundred ninety-four million, eight hundred seventeen thousand, eight hundred fifty-six".