394243938 has 24 divisors (see below), whose sum is σ = 931849776. Its totient is φ = 119467800.

The previous prime is 394243931. The next prime is 394243963. The reversal of 394243938 is 839342493.

It is a junction number, because it is equal to n+sod(n) for n = 394243893 and 394243902.

It is not an unprimeable number, because it can be changed into a prime (394243931) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 995368 + ... + 995763.

It is an arithmetic number, because the mean of its divisors is an integer number (38827074).

Almost surely, 2^394243938 is an apocalyptic number.

394243938 is an abundant number, since it is smaller than the sum of its proper divisors (537605838).

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

394243938 is a wasteful number, since it uses less digits than its factorization.

394243938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991150 (or 1991147 counting only the distinct ones).

The product of its digits is 559872, while the sum is 45.

The square root of 394243938 is about 19855.5769999262. The cubic root of 394243938 is about 733.2549577855.

The spelling of 394243938 in words is "three hundred ninety-four million, two hundred forty-three thousand, nine hundred thirty-eight".