8491990 has 16 divisors (see below), whose sum is σ = 16461648. Its totient is φ = 3135456.

The previous prime is 8491969. The next prime is 8492039. The reversal of 8491990 is 991948.

It is a super-2 number, since 2×8491990² = 144227788320200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32532 + ... + 32791.

It is an arithmetic number, because the mean of its divisors is an integer number (1028853).

Almost surely, 2^8491990 is an apocalyptic number.

8491990 is a deficient number, since it is larger than the sum of its proper divisors (7969658).

8491990 is a wasteful number, since it uses less digits than its factorization.

8491990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65343.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 8491990 is about 2914.1019199747. The cubic root of 8491990 is about 204.0186289537.

The spelling of 8491990 in words is "eight million, four hundred ninety-one thousand, nine hundred ninety".