204528139 has 8 divisors (see below), whose sum is σ = 217941408. Its totient is φ = 191268480.

The previous prime is 204528133. The next prime is 204528143. The reversal of 204528139 is 931825402.

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 204528139 - 2⁷ = 204528011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204528133) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35647 + ... + 40984.

It is an arithmetic number, because the mean of its divisors is an integer number (27242676).

Almost surely, 2^204528139 is an apocalyptic number.

204528139 is a deficient number, since it is larger than the sum of its proper divisors (13413269).

204528139 is a wasteful number, since it uses less digits than its factorization.

204528139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76805.

The product of its (nonzero) digits is 17280, while the sum is 34.

The square root of 204528139 is about 14301.3334692958. Note that the first 3 decimals coincide. The cubic root of 204528139 is about 589.1841054127.

The spelling of 204528139 in words is "two hundred four million, five hundred twenty-eight thousand, one hundred thirty-nine".