9993990 has 32 divisors (see below), whose sum is σ = 24178176. Its totient is φ = 2643680.

The previous prime is 9993989. The next prime is 9994001. The reversal of 9993990 is 993999.

9993990 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×9993990² = 199759672240200, which contains 22 as substring.

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, 2659 + ... + 5201.

It is an arithmetic number, because the mean of its divisors is an integer number (755568).

Almost surely, 2^9993990 is an apocalyptic number.

9993990 is an abundant number, since it is smaller than the sum of its proper divisors (14184186).

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

9993990 is a wasteful number, since it uses less digits than its factorization.

9993990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2684.

The product of its (nonzero) digits is 177147, while the sum is 48.

The square root of 9993990 is about 3161.3272529113. The cubic root of 9993990 is about 215.4002998455.

The spelling of 9993990 in words is "nine million, nine hundred ninety-three thousand, nine hundred ninety".