900204309 has 6 divisors (see below), whose sum is σ = 1300295126. Its totient is φ = 600136200.

The previous prime is 900204299. The next prime is 900204313. The reversal of 900204309 is 903402009.

It can be written as a sum of positive squares in only one way, i.e., 754326225 + 145878084 = 27465^2 + 12078^2 .

It is not a de Polignac number, because 900204309 - 2⁹ = 900203797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (900204379) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 50011342 + ... + 50011359.

Almost surely, 2^900204309 is an apocalyptic number.

It is an amenable number.

900204309 is a deficient number, since it is larger than the sum of its proper divisors (400090817).

900204309 is a wasteful number, since it uses less digits than its factorization.

900204309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100022707 (or 100022704 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 900204309 is about 30003.4049567712. The cubic root of 900204309 is about 965.5624376597.

It can be divided in two parts, 900 and 204309, that added together give a square (205209 = 453²).

The spelling of 900204309 in words is "nine hundred million, two hundred four thousand, three hundred nine".