9923990 has 16 divisors (see below), whose sum is σ = 17901648. Its totient is φ = 3961056.

The previous prime is 9923989. The next prime is 9923993. The reversal of 9923990 is 993299.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9923993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6104 + ... + 7556.

It is an arithmetic number, because the mean of its divisors is an integer number (1118853).

Almost surely, 2^9923990 is an apocalyptic number.

9923990 is a deficient number, since it is larger than the sum of its proper divisors (7977658).

9923990 is a wasteful number, since it uses less digits than its factorization.

9923990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2143.

The product of its (nonzero) digits is 39366, while the sum is 41.

The square root of 9923990 is about 3150.2364990584. The cubic root of 9923990 is about 214.8962181650.

The spelling of 9923990 in words is "nine million, nine hundred twenty-three thousand, nine hundred ninety".