3224721 has 4 divisors (see below), whose sum is σ = 4299632. Its totient is φ = 2149812.

The previous prime is 3224719. The next prime is 3224723. The reversal of 3224721 is 1274223.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (3224719) and next prime (3224723).

It is not a de Polignac number, because 3224721 - 2¹ = 3224719 is a prime.

It is a D-number.

It is a Duffinian number.

3224721 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (3224723) 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, 537451 + ... + 537456.

It is an arithmetic number, because the mean of its divisors is an integer number (1074908).

Almost surely, 2^3224721 is an apocalyptic number.

It is an amenable number.

3224721 is a deficient number, since it is larger than the sum of its proper divisors (1074911).

3224721 is a wasteful number, since it uses less digits than its factorization.

3224721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074910.

The product of its digits is 672, while the sum is 21.

The square root of 3224721 is about 1795.7508179032. The cubic root of 3224721 is about 147.7397575362.

Adding to 3224721 its reverse (1274223), we get a palindrome (4498944).

It can be divided in two parts, 32 and 24721, that added together give a triangular number (24753 = T₂₂₂).

The spelling of 3224721 in words is "three million, two hundred twenty-four thousand, seven hundred twenty-one".