394187938 has 16 divisors (see below), whose sum is σ = 620136000. Its totient is φ = 187563376.

The previous prime is 394187903. The next prime is 394187947. The reversal of 394187938 is 839781493.

It is a super-3 number, since 3×394187938³ (a number of 27 digits) contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12688 + ... + 30811.

It is an arithmetic number, because the mean of its divisors is an integer number (38758500).

Almost surely, 2^394187938 is an apocalyptic number.

394187938 is a deficient number, since it is larger than the sum of its proper divisors (225948062).

394187938 is a wasteful number, since it uses less digits than its factorization.

394187938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43721.

The product of its digits is 1306368, while the sum is 52.

The square root of 394187938 is about 19854.1667667016. The cubic root of 394187938 is about 733.2202379770.

The spelling of 394187938 in words is "three hundred ninety-four million, one hundred eighty-seven thousand, nine hundred thirty-eight".