394380878 has 4 divisors (see below), whose sum is σ = 591571320. Its totient is φ = 197190438.

The previous prime is 394380859. The next prime is 394380887. The reversal of 394380878 is 878083493.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98595218 + ... + 98595221.

It is an arithmetic number, because the mean of its divisors is an integer number (147892830).

Almost surely, 2^394380878 is an apocalyptic number.

394380878 is a deficient number, since it is larger than the sum of its proper divisors (197190442).

394380878 is a wasteful number, since it uses less digits than its factorization.

394380878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197190441.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 394380878 is about 19859.0251019530. The cubic root of 394380878 is about 733.3398462691.

The spelling of 394380878 in words is "three hundred ninety-four million, three hundred eighty thousand, eight hundred seventy-eight".