9771990 has 32 divisors (see below), whose sum is σ = 23556096. Its totient is φ = 2594400.

The previous prime is 9771977. The next prime is 9771997. The reversal of 9771990 is 991779.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9771997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7915 + ... + 9065.

It is an arithmetic number, because the mean of its divisors is an integer number (736128).

Almost surely, 2^9771990 is an apocalyptic number.

9771990 is an abundant number, since it is smaller than the sum of its proper divisors (13784106).

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

9771990 is a wasteful number, since it uses less digits than its factorization.

9771990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444.

The product of its (nonzero) digits is 35721, while the sum is 42.

The square root of 9771990 is about 3126.0182341119. The cubic root of 9771990 is about 213.7934216359.

The spelling of 9771990 in words is "nine million, seven hundred seventy-one thousand, nine hundred ninety".