9975990 has 32 divisors (see below), whose sum is σ = 24040800. Its totient is φ = 2649344.

The previous prime is 9975989. The next prime is 9976003. The reversal of 9975990 is 995799.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8986 + ... + 10034.

It is an arithmetic number, because the mean of its divisors is an integer number (751275).

Almost surely, 2^9975990 is an apocalyptic number.

9975990 is an abundant number, since it is smaller than the sum of its proper divisors (14064810).

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

9975990 is a wasteful number, since it uses less digits than its factorization.

9975990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376.

The product of its (nonzero) digits is 229635, while the sum is 48.

The square root of 9975990 is about 3158.4790643599. The cubic root of 9975990 is about 215.2709042304.

The spelling of 9975990 in words is "nine million, nine hundred seventy-five thousand, nine hundred ninety".