9899870 has 16 divisors (see below), whose sum is σ = 18156960. Its totient is φ = 3885024.

The previous prime is 9899863. The next prime is 9899887. The reversal of 9899870 is 789989.

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, 8810 + ... + 9869.

It is an arithmetic number, because the mean of its divisors is an integer number (1134810).

Almost surely, 2^9899870 is an apocalyptic number.

9899870 is a deficient number, since it is larger than the sum of its proper divisors (8257090).

9899870 is a wasteful number, since it uses less digits than its factorization.

9899870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18739.

The product of its (nonzero) digits is 326592, while the sum is 50.

The square root of 9899870 is about 3146.4058860865. The cubic root of 9899870 is about 214.7219770332.

The spelling of 9899870 in words is "nine million, eight hundred ninety-nine thousand, eight hundred seventy".