900990100 has 18 divisors (see below), whose sum is σ = 1955148734. Its totient is φ = 360396000.

The previous prime is 900990091. The next prime is 900990119. The reversal of 900990100 is 1099009.

It can be written as a sum of positive squares in 3 ways, for example, as 147816964 + 753173136 = 12158^2 + 27444^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4504851 + ... + 4505050.

Almost surely, 2^900990100 is an apocalyptic number.

It is an amenable number.

900990100 is an abundant number, since it is smaller than the sum of its proper divisors (1054158634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

900990100 is a wasteful number, since it uses less digits than its factorization.

900990100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9009915 (or 9009908 counting only the distinct ones).

The product of its (nonzero) digits is 729, while the sum is 28.

The square root of 900990100 is about 30016.4971307446. The cubic root of 900990100 is about 965.8433033872.

The spelling of 900990100 in words is "nine hundred million, nine hundred ninety thousand, one hundred".