2453721 has 4 divisors (see below), whose sum is σ = 3271632. Its totient is φ = 1635812.

The previous prime is 2453713. The next prime is 2453747. The reversal of 2453721 is 1273542.

2453721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2453721 - 2³ = 2453713 is a prime.

It is a D-number.

It is a junction number, because it is equal to n+sod(n) for n = 2453691 and 2453700.

It is not an unprimeable number, because it can be changed into a prime (2453701) 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, 408951 + ... + 408956.

It is an arithmetic number, because the mean of its divisors is an integer number (817908).

2^2453721 is an apocalyptic number.

It is an amenable number.

2453721 is a deficient number, since it is larger than the sum of its proper divisors (817911).

2453721 is an equidigital number, since it uses as much as digits as its factorization.

2453721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 817910.

The product of its digits is 1680, while the sum is 24.

The square root of 2453721 is about 1566.4357631260. The cubic root of 2453721 is about 134.8781891626.

The spelling of 2453721 in words is "two million, four hundred fifty-three thousand, seven hundred twenty-one".