9999890 has 16 divisors (see below), whose sum is σ = 18947520. Its totient is φ = 3789360.

The previous prime is 9999889. The next prime is 9999901. The reversal of 9999890 is 989999.

It is a happy 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, 26126 + ... + 26505.

It is an arithmetic number, because the mean of its divisors is an integer number (1184220).

Almost surely, 2^9999890 is an apocalyptic number.

9999890 is a deficient number, since it is larger than the sum of its proper divisors (8947630).

9999890 is a wasteful number, since it uses less digits than its factorization.

9999890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52657.

The product of its (nonzero) digits is 472392, while the sum is 53.

The square root of 9999890 is about 3162.2602675934. The cubic root of 9999890 is about 215.4426790409.

The spelling of 9999890 in words is "nine million, nine hundred ninety-nine thousand, eight hundred ninety".