399894 has 32 divisors (see below), whose sum is σ = 895104. Its totient is φ = 118080.

The previous prime is 399887. The next prime is 399899. The reversal of 399894 is 498993.

399894 is nontrivially palindromic in base 16.

399894 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is a super-2 number, since 2×399894² = 319830422472, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399899) by changing a digit.

399894 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4777 + ... + 4859.

It is an arithmetic number, because the mean of its divisors is an integer number (27972).

2³⁹⁹⁸⁹⁴ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 399894, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (447552).

399894 is an abundant number, since it is smaller than the sum of its proper divisors (495210).

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

399894 is a wasteful number, since it uses less digits than its factorization.

399894 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172.

The product of its digits is 69984, while the sum is 42.

The square root of 399894 is about 632.3717261232. The cubic root of 399894 is about 73.6741209422.

Subtracting 399894 from its reverse (498993), we obtain a palindrome (99099).

It can be divided in two parts, 39989 and 4, that added together give a palindrome (39993).

The spelling of 399894 in words is "three hundred ninety-nine thousand, eight hundred ninety-four".