309242 has 4 divisors (see below), whose sum is σ = 463866. Its totient is φ = 154620.

The previous prime is 309241. The next prime is 309251. The reversal of 309242 is 242903.

309242 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

309242 is an esthetic number in base 5, because in such base its adjacent digits differ by 1.

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

It can be written as a sum of positive squares in only one way, i.e., 212521 + 96721 = 461^2 + 311^2 .

It is a super-2 number, since 2×309242² = 191261229128, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 309242.

It is not an unprimeable number, because it can be changed into a prime (309241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 77309 + ... + 77312.

2³⁰⁹²⁴² is an apocalyptic number.

309242 is a deficient number, since it is larger than the sum of its proper divisors (154624).

309242 is a wasteful number, since it uses less digits than its factorization.

309242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154623.

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 309242 is about 556.0953155710. The cubic root of 309242 is about 67.6237874807.

The spelling of 309242 in words is "three hundred nine thousand, two hundred forty-two".