7503721 has 8 divisors (see below), whose sum is σ = 7795080. Its totient is φ = 7214592.

The previous prime is 7503703. The next prime is 7503731. The reversal of 7503721 is 1273057.

It can be written as a sum of positive squares in 4 ways, for example, as 2941225 + 4562496 = 1715^2 + 2136^2 .

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 7503721 - 2¹⁷ = 7372649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7503701) 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, 9871 + ... + 10603.

It is an arithmetic number, because the mean of its divisors is an integer number (974385).

Almost surely, 2^7503721 is an apocalyptic number.

It is an amenable number.

7503721 is a deficient number, since it is larger than the sum of its proper divisors (291359).

7503721 is a wasteful number, since it uses less digits than its factorization.

7503721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1115.

The product of its (nonzero) digits is 1470, while the sum is 25.

The square root of 7503721 is about 2739.2920618291. The cubic root of 7503721 is about 195.7757483119.

Adding to 7503721 its reverse (1273057), we get a palindrome (8776778).

The spelling of 7503721 in words is "seven million, five hundred three thousand, seven hundred twenty-one".