399822 has 16 divisors (see below), whose sum is σ = 821712. Its totient is φ = 129600.

The previous prime is 399793. The next prime is 399851. The reversal of 399822 is 228993.

It is an interprime number because it is at equal distance from previous prime (399793) and next prime (399851).

It is a congruent number.

It is an unprimeable number.

399822 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 7 ways as a sum of consecutive naturals, for example, 679 + ... + 1122.

It is an arithmetic number, because the mean of its divisors is an integer number (51357).

2³⁹⁹⁸²² is an apocalyptic number.

399822 is an abundant number, since it is smaller than the sum of its proper divisors (421890).

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

399822 is a wasteful number, since it uses less digits than its factorization.

399822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1843.

The product of its digits is 7776, while the sum is 33.

The square root of 399822 is about 632.3147950191. The cubic root of 399822 is about 73.6696990578.

It can be divided in two parts, 399 and 822, that added together give a palindrome (1221).

The spelling of 399822 in words is "three hundred ninety-nine thousand, eight hundred twenty-two".