394947878 has 16 divisors (see below), whose sum is σ = 639149616. Its totient is φ = 181953120.

The previous prime is 394947877. The next prime is 394947929. The reversal of 394947878 is 878749493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394947877) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1148 + ... + 28128.

It is an arithmetic number, because the mean of its divisors is an integer number (39946851).

Almost surely, 2^394947878 is an apocalyptic number.

394947878 is a deficient number, since it is larger than the sum of its proper divisors (244201738).

394947878 is a wasteful number, since it uses less digits than its factorization.

394947878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27559.

The product of its digits is 12192768, while the sum is 59.

The square root of 394947878 is about 19873.2955998747. The cubic root of 394947878 is about 733.6911180206.

The spelling of 394947878 in words is "three hundred ninety-four million, nine hundred forty-seven thousand, eight hundred seventy-eight".