900000005 has 16 divisors (see below), whose sum is σ = 1137504384. Its totient is φ = 682249920.

The previous prime is 899999963. The next prime is 900000011. The reversal of 900000005 is 500000009.

It is a de Polignac number, because none of the positive numbers 2^k-900000005 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5) 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, 24266 + ... + 48875.

It is an arithmetic number, because the mean of its divisors is an integer number (71094024).

Almost surely, 2^900000005 is an apocalyptic number.

It is an amenable number.

900000005 is a deficient number, since it is larger than the sum of its proper divisors (237504379).

900000005 is a wasteful number, since it uses less digits than its factorization.

900000005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73276.

The product of its (nonzero) digits is 45, while the sum is 14.

The square root of 900000005 is about 30000.0000833333. Note that the first 4 decimals coincide. The cubic root of 900000005 is about 965.4893863936.

The spelling of 900000005 in words is "nine hundred million, five", and thus it is an aban number.