9990870 has 16 divisors (see below), whose sum is σ = 23978160. Its totient is φ = 2664224.

The previous prime is 9990863. The next prime is 9990887. The reversal of 9990870 is 780999.

It is a happy number.

9990870 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 166485 + ... + 166544.

It is an arithmetic number, because the mean of its divisors is an integer number (1498635).

Almost surely, 2^9990870 is an apocalyptic number.

9990870 is an abundant number, since it is smaller than the sum of its proper divisors (13987290).

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

9990870 is a wasteful number, since it uses less digits than its factorization.

9990870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333039.

The product of its (nonzero) digits is 40824, while the sum is 42.

The square root of 9990870 is about 3160.8337507689. The cubic root of 9990870 is about 215.3778824099.

The spelling of 9990870 in words is "nine million, nine hundred ninety thousand, eight hundred seventy".