394968818 has 4 divisors (see below), whose sum is σ = 592453230. Its totient is φ = 197484408.

The previous prime is 394968817. The next prime is 394968829. The reversal of 394968818 is 818869493.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 818869493 = 13 ⋅62989961.

It can be written as a sum of positive squares in only one way, i.e., 270043489 + 124925329 = 16433^2 + 11177^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (394968817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98742203 + ... + 98742206.

Almost surely, 2^394968818 is an apocalyptic number.

394968818 is a deficient number, since it is larger than the sum of its proper divisors (197484412).

394968818 is a wasteful number, since it uses less digits than its factorization.

394968818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197484411.

The product of its digits is 2985984, while the sum is 56.

The square root of 394968818 is about 19873.8224305240. The cubic root of 394968818 is about 733.7040844746.

The spelling of 394968818 in words is "three hundred ninety-four million, nine hundred sixty-eight thousand, eight hundred eighteen".