204252909 has 16 divisors (see below), whose sum is σ = 329551488. Its totient is φ = 109850112.

The previous prime is 204252899. The next prime is 204252941. The reversal of 204252909 is 909252402.

It is not a de Polignac number, because 204252909 - 2¹² = 204248813 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 204252909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (204252989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 285712 + ... + 286425.

It is an arithmetic number, because the mean of its divisors is an integer number (20596968).

Almost surely, 2^204252909 is an apocalyptic number.

It is an amenable number.

204252909 is a deficient number, since it is larger than the sum of its proper divisors (125298579).

204252909 is a wasteful number, since it uses less digits than its factorization.

204252909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 572164.

The product of its (nonzero) digits is 12960, while the sum is 33.

The square root of 204252909 is about 14291.7077006214. The cubic root of 204252909 is about 588.9197018027.

The spelling of 204252909 in words is "two hundred four million, two hundred fifty-two thousand, nine hundred nine".