394256977 has 6 divisors (see below), whose sum is σ = 407386194. Its totient is φ = 381538080.

The previous prime is 394256971. The next prime is 394257023. The reversal of 394256977 is 779652493.

It can be written as a sum of positive squares in only one way, i.e., 392396481 + 1860496 = 19809^2 + 1364^2 .

It is not a de Polignac number, because 394256977 - 2¹¹ = 394254929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394256971) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 204168 + ... + 206089.

It is an arithmetic number, because the mean of its divisors is an integer number (67897699).

Almost surely, 2^394256977 is an apocalyptic number.

It is an amenable number.

394256977 is a deficient number, since it is larger than the sum of its proper divisors (13129217).

394256977 is an equidigital number, since it uses as much as digits as its factorization.

394256977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410319 (or 410288 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 52.

The square root of 394256977 is about 19855.9053432474. The cubic root of 394256977 is about 733.2630414490.

The spelling of 394256977 in words is "three hundred ninety-four million, two hundred fifty-six thousand, nine hundred seventy-seven".