9891090 has 96 divisors (see below), whose sum is σ = 28619136. Its totient is φ = 2350080.

The previous prime is 9891061. The next prime is 9891097. The reversal of 9891090 is 901989.

9891090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×9891090² = 195667322776200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9891097) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 95979 + ... + 96081.

It is an arithmetic number, because the mean of its divisors is an integer number (298116).

Almost surely, 2^9891090 is an apocalyptic number.

9891090 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 9891090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14309568).

9891090 is an abundant number, since it is smaller than the sum of its proper divisors (18728046).

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

9891090 is a wasteful number, since it uses less digits than its factorization.

9891090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224 (or 221 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 36.

The square root of 9891090 is about 3145.0103338463. The cubic root of 9891090 is about 214.6584806921.

The spelling of 9891090 in words is "nine million, eight hundred ninety-one thousand, ninety".