9783990 has 80 divisors (see below), whose sum is σ = 26972352. Its totient is φ = 2543616.

The previous prime is 9783989. The next prime is 9784007. The reversal of 9783990 is 993879.

It is a happy number.

9783990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 37942 + ... + 38198.

Almost surely, 2^9783990 is an apocalyptic number.

9783990 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 9783990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13486176).

9783990 is an abundant number, since it is smaller than the sum of its proper divisors (17188362).

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

9783990 is a wasteful number, since it uses less digits than its factorization.

9783990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323 (or 314 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 9783990 is about 3127.9370198263. The cubic root of 9783990 is about 213.8808985852.

The spelling of 9783990 in words is "nine million, seven hundred eighty-three thousand, nine hundred ninety".