2782221 has 8 divisors (see below), whose sum is σ = 3995040. Its totient is φ = 1712112.

The previous prime is 2782217. The next prime is 2782279. The reversal of 2782221 is 1222872.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2782221 - 2² = 2782217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2782191 and 2782200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2782201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35631 + ... + 35708.

It is an arithmetic number, because the mean of its divisors is an integer number (499380).

2^2782221 is an apocalyptic number.

It is an amenable number.

2782221 is a deficient number, since it is larger than the sum of its proper divisors (1212819).

2782221 is a wasteful number, since it uses less digits than its factorization.

2782221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71355.

The product of its digits is 896, while the sum is 24.

The square root of 2782221 is about 1667.9991007192. Note that the first 3 decimals coincide. The cubic root of 2782221 is about 140.6470221314.

It can be divided in two parts, 2782 and 221, that added together give a palindrome (3003).

The spelling of 2782221 in words is "two million, seven hundred eighty-two thousand, two hundred twenty-one".