309798 has 16 divisors (see below), whose sum is σ = 688560. Its totient is φ = 103248.

The previous prime is 309797. The next prime is 309811. The reversal of 309798 is 897903.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309798.

It is not an unprimeable number, because it can be changed into a prime (309797) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2815 + ... + 2922.

It is an arithmetic number, because the mean of its divisors is an integer number (43035).

2³⁰⁹⁷⁹⁸ is an apocalyptic number.

309798 is an abundant number, since it is smaller than the sum of its proper divisors (378762).

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

309798 is a wasteful number, since it uses less digits than its factorization.

309798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5748 (or 5742 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 309798 is about 556.5950053675. The cubic root of 309798 is about 67.6642911583.

The spelling of 309798 in words is "three hundred nine thousand, seven hundred ninety-eight".