7152721 has 8 divisors (see below), whose sum is σ = 7672320. Its totient is φ = 6647472.

The previous prime is 7152703. The next prime is 7152751. The reversal of 7152721 is 1272517.

It is a happy number.

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

It is not a de Polignac number, because 7152721 - 2¹¹ = 7150673 is a prime.

It is a super-2 number, since 2×7152721² = 102322835407682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7152751) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2545 + ... + 4558.

It is an arithmetic number, because the mean of its divisors is an integer number (959040).

Almost surely, 2^7152721 is an apocalyptic number.

It is an amenable number.

7152721 is a deficient number, since it is larger than the sum of its proper divisors (519599).

7152721 is a wasteful number, since it uses less digits than its factorization.

7152721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7175.

The product of its digits is 980, while the sum is 25.

The square root of 7152721 is about 2674.4571411784. The cubic root of 7152721 is about 192.6742875357.

The spelling of 7152721 in words is "seven million, one hundred fifty-two thousand, seven hundred twenty-one".