309542 has 16 divisors (see below), whose sum is σ = 492480. Its totient is φ = 145728.

The previous prime is 309541. The next prime is 309559. The reversal of 309542 is 245903.

It is a plaindrome in base 8.

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 309542.

It is not an unprimeable number, because it can be changed into a prime (309541) 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, 3434 + ... + 3522.

It is an arithmetic number, because the mean of its divisors is an integer number (30780).

2³⁰⁹⁵⁴² is an apocalyptic number.

309542 is a deficient number, since it is larger than the sum of its proper divisors (182938).

309542 is a wasteful number, since it uses less digits than its factorization.

309542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 309542 is about 556.3649881148. The cubic root of 309542 is about 67.6456480079.

The spelling of 309542 in words is "three hundred nine thousand, five hundred forty-two".