394734218 has 4 divisors (see below), whose sum is σ = 592101330. Its totient is φ = 197367108.

The previous prime is 394734217. The next prime is 394734229. The reversal of 394734218 is 812437493.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 357852889 + 36881329 = 18917^2 + 6073^2 .

It is not an unprimeable number, because it can be changed into a prime (394734217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98683553 + ... + 98683556.

Almost surely, 2^394734218 is an apocalyptic number.

394734218 is a deficient number, since it is larger than the sum of its proper divisors (197367112).

394734218 is a wasteful number, since it uses less digits than its factorization.

394734218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197367111.

The product of its digits is 145152, while the sum is 41.

The square root of 394734218 is about 19867.9193173316. The cubic root of 394734218 is about 733.5587894023.

The spelling of 394734218 in words is "three hundred ninety-four million, seven hundred thirty-four thousand, two hundred eighteen".