394626866 has 4 divisors (see below), whose sum is σ = 591940302. Its totient is φ = 197313432.

The previous prime is 394626863. The next prime is 394626877. The reversal of 394626866 is 668626493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 668626493 = 2789 ⋅239737.

It can be written as a sum of positive squares in only one way, i.e., 206525641 + 188101225 = 14371^2 + 13715^2 .

It is not an unprimeable number, because it can be changed into a prime (394626863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98656715 + ... + 98656718.

Almost surely, 2^394626866 is an apocalyptic number.

394626866 is a deficient number, since it is larger than the sum of its proper divisors (197313436).

394626866 is a wasteful number, since it uses less digits than its factorization.

394626866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197313435.

The product of its digits is 2239488, while the sum is 50.

The square root of 394626866 is about 19865.2174918877. The cubic root of 394626866 is about 733.4922837726.

The spelling of 394626866 in words is "three hundred ninety-four million, six hundred twenty-six thousand, eight hundred sixty-six".