394878478 has 4 divisors (see below), whose sum is σ = 592317720. Its totient is φ = 197439238.

The previous prime is 394878401. The next prime is 394878479. The reversal of 394878478 is 874878493.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394878479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98719618 + ... + 98719621.

It is an arithmetic number, because the mean of its divisors is an integer number (148079430).

Almost surely, 2^394878478 is an apocalyptic number.

394878478 is a deficient number, since it is larger than the sum of its proper divisors (197439242).

394878478 is a wasteful number, since it uses less digits than its factorization.

394878478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197439241.

The product of its digits is 10838016, while the sum is 58.

The square root of 394878478 is about 19871.5494614788. The cubic root of 394878478 is about 733.6481409181.

The spelling of 394878478 in words is "three hundred ninety-four million, eight hundred seventy-eight thousand, four hundred seventy-eight".