394883921 has 8 divisors (see below), whose sum is σ = 417103104. Its totient is φ = 373257360.

The previous prime is 394883917. The next prime is 394883947. The reversal of 394883921 is 129388493.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 394883921 - 2² = 394883917 is a prime.

It is a super-2 number, since 2×394883921² = 311866622128668482, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (394883971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 146786 + ... + 149451.

It is an arithmetic number, because the mean of its divisors is an integer number (52137888).

Almost surely, 2^394883921 is an apocalyptic number.

394883921 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

394883921 is a deficient number, since it is larger than the sum of its proper divisors (22219183).

394883921 is a wasteful number, since it uses less digits than its factorization.

394883921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296311.

The product of its digits is 373248, while the sum is 47.

The square root of 394883921 is about 19871.6864156015. The cubic root of 394883921 is about 733.6515117682.

The spelling of 394883921 in words is "three hundred ninety-four million, eight hundred eighty-three thousand, nine hundred twenty-one".