4233721 has 4 divisors (see below), whose sum is σ = 4239972. Its totient is φ = 4227472.

The previous prime is 4233709. The next prime is 4233743. The reversal of 4233721 is 1273324.

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 2595321 + 1638400 = 1611^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 4233721 - 2¹⁵ = 4200953 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4233692 and 4233701.

It is not an unprimeable number, because it can be changed into a prime (4233121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1966 + ... + 3511.

It is an arithmetic number, because the mean of its divisors is an integer number (1059993).

Almost surely, 2^4233721 is an apocalyptic number.

It is an amenable number.

4233721 is a deficient number, since it is larger than the sum of its proper divisors (6251).

4233721 is an equidigital number, since it uses as much as digits as its factorization.

4233721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6250.

The product of its digits is 1008, while the sum is 22.

The square root of 4233721 is about 2057.6007873249. The cubic root of 4233721 is about 161.7735111668.

The spelling of 4233721 in words is "four million, two hundred thirty-three thousand, seven hundred twenty-one".