394000999 has 4 divisors (see below), whose sum is σ = 450286864. Its totient is φ = 337715136.

The previous prime is 394000987. The next prime is 394001009. The reversal of 394000999 is 999000493.

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

It is a cyclic number.

It is not a de Polignac number, because 394000999 - 2¹⁵ = 393968231 is a prime.

It is a Duffinian number.

394000999 is a modest number, since divided by 999 gives 394 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (394000799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28142922 + ... + 28142935.

It is an arithmetic number, because the mean of its divisors is an integer number (112571716).

Almost surely, 2^394000999 is an apocalyptic number.

394000999 is a deficient number, since it is larger than the sum of its proper divisors (56285865).

394000999 is an equidigital number, since it uses as much as digits as its factorization.

394000999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56285864.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 394000999 is about 19849.4584057097. The cubic root of 394000999 is about 733.1043126209.

The spelling of 394000999 in words is "three hundred ninety-four million, nine hundred ninety-nine", and thus it is an aban number.