394424857 has 4 divisors (see below), whose sum is σ = 415184080. Its totient is φ = 373665636.

The previous prime is 394424831. The next prime is 394424867. The reversal of 394424857 is 758424493.

It is a happy number.

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, and also an emirpimes, since its reverse is a distinct semiprime: 758424493 = 163 ⋅4652911.

It is a cyclic number.

It is not a de Polignac number, because 394424857 - 2⁷ = 394424729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394424867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10379583 + ... + 10379620.

It is an arithmetic number, because the mean of its divisors is an integer number (103796020).

Almost surely, 2^394424857 is an apocalyptic number.

It is an amenable number.

394424857 is a deficient number, since it is larger than the sum of its proper divisors (20759223).

394424857 is a wasteful number, since it uses less digits than its factorization.

394424857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20759222.

The product of its digits is 967680, while the sum is 46.

The square root of 394424857 is about 19860.1323510192. The cubic root of 394424857 is about 733.3671044824.

The spelling of 394424857 in words is "three hundred ninety-four million, four hundred twenty-four thousand, eight hundred fifty-seven".