7283721 has 16 divisors (see below), whose sum is σ = 9992960. Its totient is φ = 4717440.

The previous prime is 7283719. The next prime is 7283723. The reversal of 7283721 is 1273827.

It is an interprime number because it is at equal distance from previous prime (7283719) and next prime (7283723).

It is not a de Polignac number, because 7283721 - 2¹ = 7283719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7283723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17091 + ... + 17511.

It is an arithmetic number, because the mean of its divisors is an integer number (624560).

Almost surely, 2^7283721 is an apocalyptic number.

It is an amenable number.

7283721 is a deficient number, since it is larger than the sum of its proper divisors (2709239).

7283721 is a wasteful number, since it uses less digits than its factorization.

7283721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 576.

The product of its digits is 4704, while the sum is 30.

The square root of 7283721 is about 2698.8369717343. The cubic root of 7283721 is about 193.8434365837.

The spelling of 7283721 in words is "seven million, two hundred eighty-three thousand, seven hundred twenty-one".