7254721 has 4 divisors (see below), whose sum is σ = 7260372. Its totient is φ = 7249072.

The previous prime is 7254719. The next prime is 7254743. The reversal of 7254721 is 1274527.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1274527 = 113 ⋅11279.

It can be written as a sum of positive squares in 2 ways, for example, as 3686400 + 3568321 = 1920^2 + 1889^2 .

It is a cyclic number.

It is not a de Polignac number, because 7254721 - 2¹ = 7254719 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7254721.

It is not an unprimeable number, because it can be changed into a prime (7254761) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135 + ... + 3811.

It is an arithmetic number, because the mean of its divisors is an integer number (1815093).

Almost surely, 2^7254721 is an apocalyptic number.

It is an amenable number.

7254721 is a deficient number, since it is larger than the sum of its proper divisors (5651).

7254721 is a wasteful number, since it uses less digits than its factorization.

7254721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5650.

The product of its digits is 3920, while the sum is 28.

The square root of 7254721 is about 2693.4589285898. The cubic root of 7254721 is about 193.5858330508.

The spelling of 7254721 in words is "seven million, two hundred fifty-four thousand, seven hundred twenty-one".