2138866 has 8 divisors (see below), whose sum is σ = 3319020. Its totient is φ = 1032528.

The previous prime is 2138861. The next prime is 2138867. The reversal of 2138866 is 6688312.

It can be written as a sum of positive squares in 2 ways, for example, as 2030625 + 108241 = 1425^2 + 329^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (2138861) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18381 + ... + 18496.

2^2138866 is an apocalyptic number.

2138866 is a deficient number, since it is larger than the sum of its proper divisors (1180154).

2138866 is a wasteful number, since it uses less digits than its factorization.

2138866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36908.

The product of its digits is 13824, while the sum is 34.

The square root of 2138866 is about 1462.4862392515. The cubic root of 2138866 is about 128.8431079425.

The spelling of 2138866 in words is "two million, one hundred thirty-eight thousand, eight hundred sixty-six".