394431624 has 48 divisors (see below), whose sum is σ = 1080272700. Its totient is φ = 129997824.

The previous prime is 394431559. The next prime is 394431649. The reversal of 394431624 is 426134493.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 379080900 + 15350724 = 19470^2 + 3918^2 .

It is a super-2 number, since 2×394431624² = 311152612022554752, which contains 22 as substring.

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

It is a nude number because it is divisible by every one of its digits.

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 11 ways as a sum of consecutive naturals, for example, 24369 + ... + 37184.

Almost surely, 2^394431624 is an apocalyptic number.

It is an amenable number.

394431624 is an abundant number, since it is smaller than the sum of its proper divisors (685841076).

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

394431624 is a wasteful number, since it uses less digits than its factorization.

394431624 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61654 (or 61647 counting only the distinct ones).

The product of its digits is 62208, while the sum is 36.

The square root of 394431624 is about 19860.3027167261. The cubic root of 394431624 is about 733.3712984936.

The spelling of 394431624 in words is "three hundred ninety-four million, four hundred thirty-one thousand, six hundred twenty-four".