2217887 has 6 divisors (see below), whose sum is σ = 2580048. Its totient is φ = 1901004.

The previous prime is 2217881. The next prime is 2217907. The reversal of 2217887 is 7887122.

It is a de Polignac number, because none of the positive numbers 2^k-2217887 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 (2217881) 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, 22583 + ... + 22680.

It is an arithmetic number, because the mean of its divisors is an integer number (430008).

2^2217887 is an apocalyptic number.

2217887 is a deficient number, since it is larger than the sum of its proper divisors (362161).

2217887 is an equidigital number, since it uses as much as digits as its factorization.

2217887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45277 (or 45270 counting only the distinct ones).

The product of its digits is 12544, while the sum is 35.

The square root of 2217887 is about 1489.2571973974. The cubic root of 2217887 is about 130.4106736906.

It can be divided in two parts, 221788 and 7, that multiplied together give a square (1552516 = 1246²).

The spelling of 2217887 in words is "two million, two hundred seventeen thousand, eight hundred eighty-seven".