394578677 has 4 divisors (see below), whose sum is σ = 402974016. Its totient is φ = 386183340.

The previous prime is 394578673. The next prime is 394578689. The reversal of 394578677 is 776875493.

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 394578677 - 2² = 394578673 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394578673) 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, 4197599 + ... + 4197692.

It is an arithmetic number, because the mean of its divisors is an integer number (100743504).

Almost surely, 2^394578677 is an apocalyptic number.

It is an amenable number.

394578677 is a deficient number, since it is larger than the sum of its proper divisors (8395339).

394578677 is an equidigital number, since it uses as much as digits as its factorization.

394578677 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8395338.

The product of its digits is 8890560, while the sum is 56.

The square root of 394578677 is about 19864.0045559801. The cubic root of 394578677 is about 733.4624262865.

The spelling of 394578677 in words is "three hundred ninety-four million, five hundred seventy-eight thousand, six hundred seventy-seven".