7265721 has 4 divisors (see below), whose sum is σ = 9687632. Its totient is φ = 4843812.

The previous prime is 7265711. The next prime is 7265729. The reversal of 7265721 is 1275627.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 7265721 - 2⁷ = 7265593 is a prime.

It is the 2696-th Hogben number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7265729) by changing a digit.

It is a nontrivial repunit in base 2695.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1210951 + ... + 1210956.

It is an arithmetic number, because the mean of its divisors is an integer number (2421908).

Almost surely, 2^7265721 is an apocalyptic number.

It is an amenable number.

7265721 is a deficient number, since it is larger than the sum of its proper divisors (2421911).

7265721 is a wasteful number, since it uses less digits than its factorization.

7265721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2421910.

The product of its digits is 5880, while the sum is 30.

The square root of 7265721 is about 2695.5001391208. The cubic root of 7265721 is about 193.6836254084.

The spelling of 7265721 in words is "seven million, two hundred sixty-five thousand, seven hundred twenty-one".