8493990 has 16 divisors (see below), whose sum is σ = 20385648. Its totient is φ = 2265056.

The previous prime is 8493983. The next prime is 8493997. The reversal of 8493990 is 993948.

It is an interprime number because it is at equal distance from previous prime (8493983) and next prime (8493997).

It is a super-2 number, since 2×8493990² = 144295732240200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8493997) by changing a digit.

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, 141537 + ... + 141596.

It is an arithmetic number, because the mean of its divisors is an integer number (1274103).

Almost surely, 2^8493990 is an apocalyptic number.

8493990 is an abundant number, since it is smaller than the sum of its proper divisors (11891658).

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

8493990 is a wasteful number, since it uses less digits than its factorization.

8493990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283143.

The product of its (nonzero) digits is 69984, while the sum is 42.

The square root of 8493990 is about 2914.4450586690. The cubic root of 8493990 is about 204.0346442508.

Subtracting from 8493990 its sum of digits (42), we obtain a palindrome (8493948).

The spelling of 8493990 in words is "eight million, four hundred ninety-three thousand, nine hundred ninety".