2639886 has 8 divisors (see below), whose sum is σ = 5279784. Its totient is φ = 879960.

The previous prime is 2639881. The next prime is 2639887. The reversal of 2639886 is 6889362.

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

2639886 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219985 + ... + 219996.

It is an arithmetic number, because the mean of its divisors is an integer number (659973).

2^2639886 is an apocalyptic number.

2639886 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.

2639886 is a wasteful number, since it uses less digits than its factorization.

2639886 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439986.

The product of its digits is 124416, while the sum is 42.

The square root of 2639886 is about 1624.7725994735. The cubic root of 2639886 is about 138.2064752073.

The spelling of 2639886 in words is "two million, six hundred thirty-nine thousand, eight hundred eighty-six".