2166386 has 4 divisors (see below), whose sum is σ = 3249582. Its totient is φ = 1083192.

The previous prime is 2166319. The next prime is 2166403. The reversal of 2166386 is 6836612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 1575025 + 591361 = 1255^2 + 769^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 541595 + ... + 541598.

2^2166386 is an apocalyptic number.

2166386 is a deficient number, since it is larger than the sum of its proper divisors (1083196).

2166386 is a wasteful number, since it uses less digits than its factorization.

2166386 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1083195.

The product of its digits is 10368, while the sum is 32.

The square root of 2166386 is about 1471.8648035740. The cubic root of 2166386 is about 129.3933469900.

It can be divided in two parts, 2166 and 386, that added together give a palindrome (2552).

The spelling of 2166386 in words is "two million, one hundred sixty-six thousand, three hundred eighty-six".