2279921 has 24 divisors (see below), whose sum is σ = 2947200. Its totient is φ = 1759296.

The previous prime is 2279911. The next prime is 2279933. The reversal of 2279921 is 1299722.

2279921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 2279921 - 2⁶ = 2279857 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2279911) 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 23 ways as a sum of consecutive naturals, for example, 99116 + ... + 99138.

It is an arithmetic number, because the mean of its divisors is an integer number (122800).

2^2279921 is an apocalyptic number.

It is an amenable number.

2279921 is a deficient number, since it is larger than the sum of its proper divisors (667279).

2279921 is an equidigital number, since it uses as much as digits as its factorization.

2279921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78 (or 47 counting only the distinct ones).

The product of its digits is 4536, while the sum is 32.

The square root of 2279921 is about 1509.9407273135. The cubic root of 2279921 is about 131.6153671507.

The spelling of 2279921 in words is "two million, two hundred seventy-nine thousand, nine hundred twenty-one".