394243738 has 16 divisors (see below), whose sum is σ = 676387584. Its totient is φ = 168826320.

The previous prime is 394243721. The next prime is 394243739. The reversal of 394243738 is 837342493.

It is a junction number, because it is equal to n+sod(n) for n = 394243694 and 394243703.

It is not an unprimeable number, because it can be changed into a prime (394243739) 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, 7968 + ... + 29188.

It is an arithmetic number, because the mean of its divisors is an integer number (42274224).

Almost surely, 2^394243738 is an apocalyptic number.

394243738 is a deficient number, since it is larger than the sum of its proper divisors (282143846).

394243738 is a wasteful number, since it uses less digits than its factorization.

394243738 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22557.

The product of its digits is 435456, while the sum is 43.

The square root of 394243738 is about 19855.5719635572. The cubic root of 394243738 is about 733.2548337920.

The spelling of 394243738 in words is "three hundred ninety-four million, two hundred forty-three thousand, seven hundred thirty-eight".