243006139 has 4 divisors (see below), whose sum is σ = 248933160. Its totient is φ = 237079120.

The previous prime is 243006089. The next prime is 243006151. The reversal of 243006139 is 931600342.

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

It is a cyclic number.

It is not a de Polignac number, because 243006139 - 2⁹ = 243005627 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243006199) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2963449 + ... + 2963530.

It is an arithmetic number, because the mean of its divisors is an integer number (62233290).

Almost surely, 2^243006139 is an apocalyptic number.

243006139 is a deficient number, since it is larger than the sum of its proper divisors (5927021).

243006139 is an equidigital number, since it uses as much as digits as its factorization.

243006139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5927020.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 243006139 is about 15588.6541753931. The cubic root of 243006139 is about 624.0304018650.

The spelling of 243006139 in words is "two hundred forty-three million, six thousand, one hundred thirty-nine".