399994 has 8 divisors (see below), whose sum is σ = 685728. Its totient is φ = 171420.

The previous prime is 399989. The next prime is 400009. The reversal of 399994 is 499993.

399994 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a zygodrome in base 13.

It is a self number, because there is not a number n which added to its sum of digits gives 399994.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14272 + ... + 14299.

It is an arithmetic number, because the mean of its divisors is an integer number (85716).

2³⁹⁹⁹⁹⁴ is an apocalyptic number.

399994 is a deficient number, since it is larger than the sum of its proper divisors (285734).

399994 is a wasteful number, since it uses less digits than its factorization.

399994 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28580.

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

The square root of 399994 is about 632.4507885994. The cubic root of 399994 is about 73.6802615678.

Subtracting 399994 from its reverse (499993), we obtain a palindrome (99999).

The spelling of 399994 in words is "three hundred ninety-nine thousand, nine hundred ninety-four".