9900890 has 16 divisors (see below), whose sum is σ = 18436680. Its totient is φ = 3823680.

The previous prime is 9900889. The next prime is 9900893. The reversal of 9900890 is 980099.

9900890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 8048569 + 1852321 = 2837^2 + 1361^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 9900890.

It is not an unprimeable number, because it can be changed into a prime (9900893) 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, 16781 + ... + 17360.

Almost surely, 2^9900890 is an apocalyptic number.

9900890 is a deficient number, since it is larger than the sum of its proper divisors (8535790).

9900890 is a wasteful number, since it uses less digits than its factorization.

9900890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34177.

The product of its (nonzero) digits is 5832, while the sum is 35.

The square root of 9900890 is about 3146.5679716161. The cubic root of 9900890 is about 214.7293511669.

The spelling of 9900890 in words is "nine million, nine hundred thousand, eight hundred ninety".