204139985 has 8 divisors (see below), whose sum is σ = 279963456. Its totient is φ = 139981680.

The previous prime is 204139979. The next prime is 204140011. The reversal of 204139985 is 589931402.

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

It is not a de Polignac number, because 204139985 - 2¹² = 204135889 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2916251 + ... + 2916320.

It is an arithmetic number, because the mean of its divisors is an integer number (34995432).

Almost surely, 2^204139985 is an apocalyptic number.

It is an amenable number.

204139985 is a deficient number, since it is larger than the sum of its proper divisors (75823471).

204139985 is an equidigital number, since it uses as much as digits as its factorization.

204139985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5832583.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 204139985 is about 14287.7564718888. The cubic root of 204139985 is about 588.8111510388.

The spelling of 204139985 in words is "two hundred four million, one hundred thirty-nine thousand, nine hundred eighty-five".