394566144 has 80 divisors (see below), whose sum is σ = 1201345728. Its totient is φ = 112730112.

The previous prime is 394566143. The next prime is 394566163. The reversal of 394566144 is 441665493.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 394566096 and 394566105.

It is not an unprimeable number, because it can be changed into a prime (394566143) 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, 7597 + ... + 29100.

Almost surely, 2^394566144 is an apocalyptic number.

It is an amenable number.

394566144 is an abundant number, since it is smaller than the sum of its proper divisors (806779584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

394566144 is an equidigital number, since it uses as much as digits as its factorization.

394566144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36725 (or 36709 counting only the distinct ones).

The product of its digits is 311040, while the sum is 42.

The square root of 394566144 is about 19863.6890833501. The cubic root of 394566144 is about 733.4546605502.

Adding to 394566144 its sum of digits (42), we get a triangular number (394566186 = T₂₈₀₉₁).

The spelling of 394566144 in words is "three hundred ninety-four million, five hundred sixty-six thousand, one hundred forty-four".