2638866 has 8 divisors (see below), whose sum is σ = 5277744. Its totient is φ = 879620.

The previous prime is 2638849. The next prime is 2638873. The reversal of 2638866 is 6688362.

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

2638866 is an admirable number.

It is a super-2 number, since 2×2638866² = 13927227531912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219900 + ... + 219911.

It is an arithmetic number, because the mean of its divisors is an integer number (659718).

2^2638866 is an apocalyptic number.

2638866 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2638866 is a wasteful number, since it uses less digits than its factorization.

2638866 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 439816.

The product of its digits is 82944, while the sum is 39.

The square root of 2638866 is about 1624.4586790682. The cubic root of 2638866 is about 138.1886728269.

The spelling of 2638866 in words is "two million, six hundred thirty-eight thousand, eight hundred sixty-six".