309238 has 4 divisors (see below), whose sum is σ = 463860. Its totient is φ = 154618.

The previous prime is 309223. The next prime is 309241. The reversal of 309238 is 832903.

It is a happy number.

309238 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 an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is an unprimeable number.

309238 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 77308 + ... + 77311.

It is an arithmetic number, because the mean of its divisors is an integer number (115965).

2³⁰⁹²³⁸ is an apocalyptic number.

309238 is a deficient number, since it is larger than the sum of its proper divisors (154622).

309238 is a wasteful number, since it uses less digits than its factorization.

309238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154621.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 309238 is about 556.0917190536. The cubic root of 309238 is about 67.6234959115.

It can be divided in two parts, 30 and 9238, that multiplied together give a triangular number (277140 = T₇₄₄).

The spelling of 309238 in words is "three hundred nine thousand, two hundred thirty-eight".