2221785 has 24 divisors (see below), whose sum is σ = 3898440. Its totient is φ = 1170432.

The previous prime is 2221771. The next prime is 2221789. The reversal of 2221785 is 5871222.

It can be written as a sum of positive squares in 4 ways, for example, as 447561 + 1774224 = 669^2 + 1332^2 .

It is not a de Polignac number, because 2221785 - 2⁵ = 2221753 is a prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 2 + 2⁴ + 2¹⁸ + 1 + 7⁴ + 8⁴ + 5⁹ .

It is not an unprimeable number, because it can be changed into a prime (2221789) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4111 + ... + 4619.

It is an arithmetic number, because the mean of its divisors is an integer number (162435).

2^2221785 is an apocalyptic number.

It is an amenable number.

2221785 is a deficient number, since it is larger than the sum of its proper divisors (1676655).

2221785 is a wasteful number, since it uses less digits than its factorization.

2221785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 617 (or 614 counting only the distinct ones).

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

The square root of 2221785 is about 1490.5653289943. The cubic root of 2221785 is about 130.4870291420.

The spelling of 2221785 in words is "two million, two hundred twenty-one thousand, seven hundred eighty-five".