2479821 has 4 divisors (see below), whose sum is σ = 3306432. Its totient is φ = 1653212.

The previous prime is 2479811. The next prime is 2479847. The reversal of 2479821 is 1289742.

It is a happy number.

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 2479821 - 2⁷ = 2479693 is a prime.

It is a super-2 number, since 2×2479821² = 12299024384082, which contains 22 as substring.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2479801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 413301 + ... + 413306.

It is an arithmetic number, because the mean of its divisors is an integer number (826608).

2^2479821 is an apocalyptic number.

It is an amenable number.

2479821 is a deficient number, since it is larger than the sum of its proper divisors (826611).

2479821 is an equidigital number, since it uses as much as digits as its factorization.

2479821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826610.

The product of its digits is 8064, while the sum is 33.

The square root of 2479821 is about 1574.7447412200. The cubic root of 2479821 is about 135.3547323670.

The spelling of 2479821 in words is "two million, four hundred seventy-nine thousand, eight hundred twenty-one".