399892 has 12 divisors (see below), whose sum is σ = 704340. Its totient is φ = 198656.

The previous prime is 399887. The next prime is 399899. The reversal of 399892 is 298993.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 274576 + 125316 = 524^2 + 354^2 .

It is a super-2 number, since 2×399892² = 319827223328, which contains 22 as substring.

Its product of digits (34992) is a multiple of the sum of its prime divisors (648).

It is a congruent number.

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

399892 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 834 + ... + 1222.

It is an arithmetic number, because the mean of its divisors is an integer number (58695).

2³⁹⁹⁸⁹² is an apocalyptic number.

It is an amenable number.

399892 is a deficient number, since it is larger than the sum of its proper divisors (304448).

399892 is a wasteful number, since it uses less digits than its factorization.

399892 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 650 (or 648 counting only the distinct ones).

The product of its digits is 34992, while the sum is 40.

The square root of 399892 is about 632.3701447728. The cubic root of 399892 is about 73.6739981192.

The spelling of 399892 in words is "three hundred ninety-nine thousand, eight hundred ninety-two".