7281990 has 24 divisors (see below), whose sum is σ = 18933408. Its totient is φ = 1941840.

The previous prime is 7281977. The next prime is 7282003. The reversal of 7281990 is 991827.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (7281977) and next prime (7282003).

It is a super-3 number, since 3×7281990³ (a number of 22 digits) contains 333 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 (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40366 + ... + 40545.

It is an arithmetic number, because the mean of its divisors is an integer number (788892).

Almost surely, 2^7281990 is an apocalyptic number.

7281990 is an abundant number, since it is smaller than the sum of its proper divisors (11651418).

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

7281990 is a wasteful number, since it uses less digits than its factorization.

7281990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80924 (or 80921 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 7281990 is about 2698.5162589838. The cubic root of 7281990 is about 193.8280795259.

The spelling of 7281990 in words is "seven million, two hundred eighty-one thousand, nine hundred ninety".