9955990 has 32 divisors (see below), whose sum is σ = 20230560. Its totient is φ = 3494400.

The previous prime is 9955949. The next prime is 9956003. The reversal of 9955990 is 995599.

It is a self number, because there is not a number n which added to its sum of digits gives 9955990.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1630 + ... + 4750.

It is an arithmetic number, because the mean of its divisors is an integer number (632205).

Almost surely, 2^9955990 is an apocalyptic number.

9955990 is an abundant number, since it is smaller than the sum of its proper divisors (10274570).

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

9955990 is a wasteful number, since it uses less digits than its factorization.

9955990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3168.

The product of its (nonzero) digits is 164025, while the sum is 46.

The square root of 9955990 is about 3155.3113950924. The cubic root of 9955990 is about 215.1269486437.

The spelling of 9955990 in words is "nine million, nine hundred fifty-five thousand, nine hundred ninety".