394247878 has 16 divisors (see below), whose sum is σ = 597012480. Its totient is φ = 195249096.

The previous prime is 394247873. The next prime is 394247897. The reversal of 394247878 is 878742493.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394247873) 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, 248893 + ... + 250471.

It is an arithmetic number, because the mean of its divisors is an integer number (37313280).

Almost surely, 2^394247878 is an apocalyptic number.

394247878 is a deficient number, since it is larger than the sum of its proper divisors (202764602).

394247878 is a wasteful number, since it uses less digits than its factorization.

394247878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2691.

The product of its digits is 2709504, while the sum is 52.

The square root of 394247878 is about 19855.6762161353. The cubic root of 394247878 is about 733.2574004482.

The spelling of 394247878 in words is "three hundred ninety-four million, two hundred forty-seven thousand, eight hundred seventy-eight".