9201990 has 64 divisors (see below), whose sum is σ = 26127360. Its totient is φ = 2029440.

The previous prime is 9201971. The next prime is 9201991. The reversal of 9201990 is 991029.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9201991) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5335 + ... + 6845.

It is an arithmetic number, because the mean of its divisors is an integer number (408240).

Almost surely, 2^9201990 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 9201990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13063680).

9201990 is an abundant number, since it is smaller than the sum of its proper divisors (16925370).

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

9201990 is a wasteful number, since it uses less digits than its factorization.

9201990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1557.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 9201990 is about 3033.4782016688. The cubic root of 9201990 is about 209.5530175322.

The spelling of 9201990 in words is "nine million, two hundred one thousand, nine hundred ninety".