394631777 has 4 divisors (see below), whose sum is σ = 395089920. Its totient is φ = 394173636.

The previous prime is 394631773. The next prime is 394631791. The reversal of 394631777 is 777136493.

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 394631777 - 2² = 394631773 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (394631773) 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, 227777 + ... + 229502.

It is an arithmetic number, because the mean of its divisors is an integer number (98772480).

Almost surely, 2^394631777 is an apocalyptic number.

It is an amenable number.

394631777 is a deficient number, since it is larger than the sum of its proper divisors (458143).

394631777 is an equidigital number, since it uses as much as digits as its factorization.

394631777 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 458142.

The product of its digits is 666792, while the sum is 47.

The square root of 394631777 is about 19865.3410995130. The cubic root of 394631777 is about 733.4953264491.

The spelling of 394631777 in words is "three hundred ninety-four million, six hundred thirty-one thousand, seven hundred seventy-seven".