394977257 has 16 divisors (see below), whose sum is σ = 415598400. Its totient is φ = 374984640.

The previous prime is 394977251. The next prime is 394977277. The reversal of 394977257 is 752779493.

It is not a de Polignac number, because 394977257 - 2⁸ = 394977001 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 394977199 and 394977208.

It is not an unprimeable number, because it can be changed into a prime (394977251) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 313094 + ... + 314352.

It is an arithmetic number, because the mean of its divisors is an integer number (25974900).

Almost surely, 2^394977257 is an apocalyptic number.

394977257 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

394977257 is a deficient number, since it is larger than the sum of its proper divisors (20621143).

394977257 is a wasteful number, since it uses less digits than its factorization.

394977257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1496.

The product of its digits is 3333960, while the sum is 53.

The square root of 394977257 is about 19874.0347438561. The cubic root of 394977257 is about 733.7093099375.

The spelling of 394977257 in words is "three hundred ninety-four million, nine hundred seventy-seven thousand, two hundred fifty-seven".