2443721 has 16 divisors (see below), whose sum is σ = 2916480. Its totient is φ = 2004480.

The previous prime is 2443703. The next prime is 2443729. The reversal of 2443721 is 1273442.

It is a cyclic number.

It is not a de Polignac number, because 2443721 - 2⁶ = 2443657 is a prime.

Its product of digits (1344) is a multiple of the sum of its prime divisors (224).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2443729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25145 + ... + 25241.

It is an arithmetic number, because the mean of its divisors is an integer number (182280).

2^2443721 is an apocalyptic number.

It is an amenable number.

2443721 is a deficient number, since it is larger than the sum of its proper divisors (472759).

2443721 is an equidigital number, since it uses as much as digits as its factorization.

2443721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224.

The product of its digits is 1344, while the sum is 23.

The square root of 2443721 is about 1563.2405445100. The cubic root of 2443721 is about 134.6947102278.

The spelling of 2443721 in words is "two million, four hundred forty-three thousand, seven hundred twenty-one".