243139 has 8 divisors (see below), whose sum is σ = 267120. Its totient is φ = 219936.

The previous prime is 243137. The next prime is 243149. The reversal of 243139 is 931342.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 243139 - 2¹ = 243137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243137) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 609 + ... + 925.

It is an arithmetic number, because the mean of its divisors is an integer number (33390).

2²⁴³¹³⁹ is an apocalyptic number.

243139 is a deficient number, since it is larger than the sum of its proper divisors (23981).

243139 is a wasteful number, since it uses less digits than its factorization.

243139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389.

The product of its digits is 648, while the sum is 22.

The square root of 243139 is about 493.0912694421. The cubic root of 243139 is about 62.4144108454.

The spelling of 243139 in words is "two hundred forty-three thousand, one hundred thirty-nine".