2845721 has 4 divisors (see below), whose sum is σ = 2969472. Its totient is φ = 2721972.

The previous prime is 2845699. The next prime is 2845723. The reversal of 2845721 is 1275482.

2845721 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 2845721 - 2⁶ = 2845657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2845723) 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, 61841 + ... + 61886.

It is an arithmetic number, because the mean of its divisors is an integer number (742368).

2^2845721 is an apocalyptic number.

It is an amenable number.

2845721 is a deficient number, since it is larger than the sum of its proper divisors (123751).

2845721 is a wasteful number, since it uses less digits than its factorization.

2845721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123750.

The product of its digits is 4480, while the sum is 29.

The square root of 2845721 is about 1686.9264951384. The cubic root of 2845721 is about 141.7090020340.

The spelling of 2845721 in words is "two million, eight hundred forty-five thousand, seven hundred twenty-one".