309342 has 32 divisors (see below), whose sum is σ = 696960. Its totient is φ = 90720.

The previous prime is 309317. The next prime is 309359. The reversal of 309342 is 243903.

It is a congruent number.

It is an unprimeable number.

309342 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 15 ways as a sum of consecutive naturals, for example, 2784 + ... + 2892.

It is an arithmetic number, because the mean of its divisors is an integer number (21780).

2³⁰⁹³⁴² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 309342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (348480).

309342 is an abundant number, since it is smaller than the sum of its proper divisors (387618).

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

309342 is a wasteful number, since it uses less digits than its factorization.

309342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168.

The product of its (nonzero) digits is 648, while the sum is 21.

The square root of 309342 is about 556.1852209471. The cubic root of 309342 is about 67.6310758934.

The spelling of 309342 in words is "three hundred nine thousand, three hundred forty-two".