2187866 has 16 divisors (see below), whose sum is σ = 3502440. Its totient is φ = 1021440.

The previous prime is 2187863. The next prime is 2187877. The reversal of 2187866 is 6687812.

It can be written as a sum of positive squares in 4 ways, for example, as 2163841 + 24025 = 1471^2 + 155^2 .

It is a super-3 number, since 3×2187866³ = 31418352832718333688, which contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (2187863) 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, 7646 + ... + 7926.

2^2187866 is an apocalyptic number.

2187866 is a deficient number, since it is larger than the sum of its proper divisors (1314574).

2187866 is a wasteful number, since it uses less digits than its factorization.

2187866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529.

The product of its digits is 32256, while the sum is 38.

The square root of 2187866 is about 1479.1436711828. The cubic root of 2187866 is about 129.8195919629.

The spelling of 2187866 in words is "two million, one hundred eighty-seven thousand, eight hundred sixty-six".