394219393 has 8 divisors (see below), whose sum is σ = 401193320. Its totient is φ = 387262080.

The previous prime is 394219381. The next prime is 394219403. The reversal of 394219393 is 393912493.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 101364624 + 292854769 = 10068^2 + 17113^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 394219393 - 2⁵ = 394219361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394219363) 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, 49813 + ... + 57181.

It is an arithmetic number, because the mean of its divisors is an integer number (50149165).

Almost surely, 2^394219393 is an apocalyptic number.

It is an amenable number.

394219393 is a deficient number, since it is larger than the sum of its proper divisors (6973927).

394219393 is an equidigital number, since it uses as much as digits as its factorization.

394219393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8307.

The product of its digits is 157464, while the sum is 43.

The square root of 394219393 is about 19854.9589019973. The cubic root of 394219393 is about 733.2397403742.

The spelling of 394219393 in words is "three hundred ninety-four million, two hundred nineteen thousand, three hundred ninety-three".