5239921 has 4 divisors (see below), whose sum is σ = 5249700. Its totient is φ = 5230144.

The previous prime is 5239909. The next prime is 5239931. The reversal of 5239921 is 1299325.

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 829921 + 4410000 = 911^2 + 2100^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5239921 is a prime.

It is a Duffinian number.

5239921 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (5239901) 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, 4036 + ... + 5173.

It is an arithmetic number, because the mean of its divisors is an integer number (1312425).

Almost surely, 2^5239921 is an apocalyptic number.

It is an amenable number.

5239921 is a deficient number, since it is larger than the sum of its proper divisors (9779).

5239921 is an equidigital number, since it uses as much as digits as its factorization.

5239921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9778.

The product of its digits is 4860, while the sum is 31.

The square root of 5239921 is about 2289.0873727318. The cubic root of 5239921 is about 173.6900391758.

The spelling of 5239921 in words is "five million, two hundred thirty-nine thousand, nine hundred twenty-one".