394574887257 has 4 divisors (see below), whose sum is σ = 526099849680. Its totient is φ = 263049924836.

The previous prime is 394574887183. The next prime is 394574887261. The reversal of 394574887257 is 752788475493.

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 394574887257 - 2⁷ = 394574887129 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 394574887191 and 394574887200.

It is not an unprimeable number, because it can be changed into a prime (394574887277) 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, 65762481207 + ... + 65762481212.

It is an arithmetic number, because the mean of its divisors is an integer number (131524962420).

Almost surely, 2^394574887257 is an apocalyptic number.

It is an amenable number.

394574887257 is a deficient number, since it is larger than the sum of its proper divisors (131524962423).

394574887257 is a wasteful number, since it uses less digits than its factorization.

394574887257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131524962422.

The product of its digits is 474163200, while the sum is 69.

The spelling of 394574887257 in words is "three hundred ninety-four billion, five hundred seventy-four million, eight hundred eighty-seven thousand, two hundred fifty-seven".