394467778 has 16 divisors (see below), whose sum is σ = 623700000. Its totient is φ = 186596352.

The previous prime is 394467769. The next prime is 394467803. The reversal of 394467778 is 877764493.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22473 + ... + 35971.

It is an arithmetic number, because the mean of its divisors is an integer number (38981250).

Almost surely, 2^394467778 is an apocalyptic number.

394467778 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

394467778 is a deficient number, since it is larger than the sum of its proper divisors (229232222).

394467778 is a wasteful number, since it uses less digits than its factorization.

394467778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14289.

The product of its digits is 7112448, while the sum is 55.

The square root of 394467778 is about 19861.2129035464. The cubic root of 394467778 is about 733.3937049930.

The spelling of 394467778 in words is "three hundred ninety-four million, four hundred sixty-seven thousand, seven hundred seventy-eight".