394042178 has 32 divisors (see below), whose sum is σ = 646410240. Its totient is φ = 179459280.

The previous prime is 394042177. The next prime is 394042189. The reversal of 394042178 is 871240493.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (394042177) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195725 + ... + 197727.

It is an arithmetic number, because the mean of its divisors is an integer number (20200320).

Almost surely, 2^394042178 is an apocalyptic number.

394042178 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

394042178 is a deficient number, since it is larger than the sum of its proper divisors (252368062).

394042178 is a wasteful number, since it uses less digits than its factorization.

394042178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2222.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 394042178 is about 19850.4956613179. The cubic root of 394042178 is about 733.1298518546.

The spelling of 394042178 in words is "three hundred ninety-four million, forty-two thousand, one hundred seventy-eight".