394404493 has 4 divisors (see below), whose sum is σ = 450748000. Its totient is φ = 338060988.

The previous prime is 394404481. The next prime is 394404499.

394404493 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 394404493 - 2⁹ = 394403981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394404499) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28171743 + ... + 28171756.

It is an arithmetic number, because the mean of its divisors is an integer number (112687000).

Almost surely, 2^394404493 is an apocalyptic number.

It is an amenable number.

394404493 is a deficient number, since it is larger than the sum of its proper divisors (56343507).

394404493 is an equidigital number, since it uses as much as digits as its factorization.

394404493 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56343506.

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 394404493 is about 19859.6196589965. The cubic root of 394404493 is about 733.3544831136.

The spelling of 394404493 in words is "three hundred ninety-four million, four hundred four thousand, four hundred ninety-three".