5239721 has 4 divisors (see below), whose sum is σ = 5311572. Its totient is φ = 5167872.

The previous prime is 5239673. The next prime is 5239753. The reversal of 5239721 is 1279325.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3279721 + 1960000 = 1811^2 + 1400^2 .

It is a cyclic number.

It is not a de Polignac number, because 5239721 - 2⁶ = 5239657 is a prime.

It is a d-powerful number, because it can be written as 5⁸ + 2² + 3⁵ + 9⁷ + 7³ + 2¹⁶ + 1 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5235721) 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, 35816 + ... + 35961.

It is an arithmetic number, because the mean of its divisors is an integer number (1327893).

Almost surely, 2^5239721 is an apocalyptic number.

It is an amenable number.

5239721 is a deficient number, since it is larger than the sum of its proper divisors (71851).

5239721 is an equidigital number, since it uses as much as digits as its factorization.

5239721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71850.

The product of its digits is 3780, while the sum is 29.

The square root of 5239721 is about 2289.0436867828. The cubic root of 5239721 is about 173.6878293174.

The spelling of 5239721 in words is "five million, two hundred thirty-nine thousand, seven hundred twenty-one".