7332721 has 6 divisors (see below), whose sum is σ = 8060066. Its totient is φ = 6666000.

The previous prime is 7332713. The next prime is 7332733. The reversal of 7332721 is 1272337.

7332721 = T₄₃₈ + T₄₃₉ + ... + T₅₀₃.

It can be written as a sum of positive squares in only one way, i.e., 7263025 + 69696 = 2695^2 + 264^2 .

It is not a de Polignac number, because 7332721 - 2³ = 7332713 is a prime.

It is a Duffinian number.

7332721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (7332751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 30180 + ... + 30421.

Almost surely, 2^7332721 is an apocalyptic number.

It is an amenable number.

7332721 is a deficient number, since it is larger than the sum of its proper divisors (727345).

7332721 is a wasteful number, since it uses less digits than its factorization.

7332721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60623 (or 60612 counting only the distinct ones).

The product of its digits is 1764, while the sum is 25.

The square root of 7332721 is about 2707.8997396506. The cubic root of 7332721 is about 194.2771484267.

The spelling of 7332721 in words is "seven million, three hundred thirty-two thousand, seven hundred twenty-one".