7281989 has 8 divisors (see below), whose sum is σ = 8555232. Its totient is φ = 6110640.

The previous prime is 7281977. The next prime is 7282003. The reversal of 7281989 is 9891827.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 7281989 - 2¹⁶ = 7216453 is a prime.

It is a super-2 number, since 2×7281989² = 106054727592242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7281919) 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 7 ways as a sum of consecutive naturals, for example, 25319 + ... + 25604.

It is an arithmetic number, because the mean of its divisors is an integer number (1069404).

Almost surely, 2^7281989 is an apocalyptic number.

It is an amenable number.

7281989 is a deficient number, since it is larger than the sum of its proper divisors (1273243).

7281989 is a wasteful number, since it uses less digits than its factorization.

7281989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50947.

The product of its digits is 72576, while the sum is 44.

The square root of 7281989 is about 2698.5160736968. The cubic root of 7281989 is about 193.8280706534.

The spelling of 7281989 in words is "seven million, two hundred eighty-one thousand, nine hundred eighty-nine".