309398 has 4 divisors (see below), whose sum is σ = 464100. Its totient is φ = 154698.

The previous prime is 309391. The next prime is 309403. The reversal of 309398 is 893903.

309398 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

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 309398.

It is not an unprimeable number, because it can be changed into a prime (309391) by changing a digit.

309398 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 as a sum of consecutive naturals, namely, 77348 + ... + 77351.

It is an arithmetic number, because the mean of its divisors is an integer number (116025).

2³⁰⁹³⁹⁸ is an apocalyptic number.

309398 is a deficient number, since it is larger than the sum of its proper divisors (154702).

309398 is a wasteful number, since it uses less digits than its factorization.

309398 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154701.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 309398 is about 556.2355616104. The cubic root of 309398 is about 67.6351567184.

It can be divided in two parts, 309 and 398, that added together give a palindrome (707).

The spelling of 309398 in words is "three hundred nine thousand, three hundred ninety-eight".