2404721 has 4 divisors (see below), whose sum is σ = 2623344. Its totient is φ = 2186100.

The previous prime is 2404687. The next prime is 2404723. The reversal of 2404721 is 1274042.

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 a cyclic number.

It is not a de Polignac number, because 2404721 - 2¹⁰ = 2403697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2404693 and 2404702.

It is not an unprimeable number, because it can be changed into a prime (2404723) 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, 109295 + ... + 109316.

It is an arithmetic number, because the mean of its divisors is an integer number (655836).

2^2404721 is an apocalyptic number.

It is an amenable number.

2404721 is a deficient number, since it is larger than the sum of its proper divisors (218623).

2404721 is a wasteful number, since it uses less digits than its factorization.

2404721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218622.

The product of its (nonzero) digits is 448, while the sum is 20.

The square root of 2404721 is about 1550.7162861078. The cubic root of 2404721 is about 133.9743212100.

Adding to 2404721 its reverse (1274042), we get a palindrome (3678763).

It can be divided in two parts, 2404 and 721, that added together give a 5-th power (3125 = 5⁵).

The spelling of 2404721 in words is "two million, four hundred four thousand, seven hundred twenty-one".