394918793 has 4 divisors (see below), whose sum is σ = 396455700. Its totient is φ = 393381888.

The previous prime is 394918739. The next prime is 394918807. The reversal of 394918793 is 397819493.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 397819493 = 491 ⋅810223.

It can be written as a sum of positive squares in 2 ways, for example, as 176677264 + 218241529 = 13292^2 + 14773^2 .

It is a cyclic number.

It is not a de Polignac number, because 394918793 - 2¹² = 394914697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394938793) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 768068 + ... + 768581.

It is an arithmetic number, because the mean of its divisors is an integer number (99113925).

Almost surely, 2^394918793 is an apocalyptic number.

It is an amenable number.

394918793 is a deficient number, since it is larger than the sum of its proper divisors (1536907).

394918793 is a wasteful number, since it uses less digits than its factorization.

394918793 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1536906.

The product of its digits is 1469664, while the sum is 53.

The square root of 394918793 is about 19872.5638255359. The cubic root of 394918793 is about 733.6731072642.

It can be divided in two parts, 39491 and 8793, that added together give a palindrome (48284).

The spelling of 394918793 in words is "three hundred ninety-four million, nine hundred eighteen thousand, seven hundred ninety-three".