399798 has 48 divisors (see below), whose sum is σ = 1048320. Its totient is φ = 107568.

The previous prime is 399793. The next prime is 399851. The reversal of 399798 is 897993.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (399793) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2311 + ... + 2477.

It is an arithmetic number, because the mean of its divisors is an integer number (21840).

2³⁹⁹⁷⁹⁸ is an apocalyptic number.

399798 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 399798, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (524160).

399798 is an abundant number, since it is smaller than the sum of its proper divisors (648522).

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

399798 is a wasteful number, since it uses less digits than its factorization.

399798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201 (or 198 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 399798 is about 632.2958168452. The cubic root of 399798 is about 73.6682249784.

It can be divided in two parts, 3997 and 98, that added together give a triangular number (4095 = T₉₀).

The spelling of 399798 in words is "three hundred ninety-nine thousand, seven hundred ninety-eight".