7417721 has 8 divisors (see below), whose sum is σ = 7610760. Its totient is φ = 7226752.

The previous prime is 7417717. The next prime is 7417747. The reversal of 7417721 is 1277147.

It can be written as a sum of positive squares in 4 ways, for example, as 4999696 + 2418025 = 2236^2 + 1555^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 7417721 - 2² = 7417717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7417021) 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, 8765 + ... + 9573.

It is an arithmetic number, because the mean of its divisors is an integer number (951345).

Almost surely, 2^7417721 is an apocalyptic number.

It is an amenable number.

7417721 is a deficient number, since it is larger than the sum of its proper divisors (193039).

7417721 is a wasteful number, since it uses less digits than its factorization.

7417721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1035.

The product of its digits is 2744, while the sum is 29.

The square root of 7417721 is about 2723.5493386388. The cubic root of 7417721 is about 195.0249453075.

The spelling of 7417721 in words is "seven million, four hundred seventeen thousand, seven hundred twenty-one".