2785221 has 6 divisors (see below), whose sum is σ = 4023110. Its totient is φ = 1856808.

The previous prime is 2785219. The next prime is 2785241. The reversal of 2785221 is 1225872.

It can be written as a sum of positive squares in only one way, i.e., 2772225 + 12996 = 1665^2 + 114^2 .

It is not a de Polignac number, because 2785221 - 2¹ = 2785219 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 (2785201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 154726 + ... + 154743.

2^2785221 is an apocalyptic number.

It is an amenable number.

2785221 is a deficient number, since it is larger than the sum of its proper divisors (1237889).

2785221 is a wasteful number, since it uses less digits than its factorization.

2785221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 309475 (or 309472 counting only the distinct ones).

The product of its digits is 2240, while the sum is 27.

The square root of 2785221 is about 1668.8981394920. The cubic root of 2785221 is about 140.6975560395.

The spelling of 2785221 in words is "two million, seven hundred eighty-five thousand, two hundred twenty-one".