2639986 has 16 divisors (see below), whose sum is σ = 4276800. Its totient is φ = 1218448.

The previous prime is 2639971. The next prime is 2639999. The reversal of 2639986 is 6899362.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 345 + ... + 2323.

It is an arithmetic number, because the mean of its divisors is an integer number (267300).

2^2639986 is an apocalyptic number.

2639986 is a deficient number, since it is larger than the sum of its proper divisors (1636814).

2639986 is a wasteful number, since it uses less digits than its factorization.

2639986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2033.

The product of its digits is 139968, while the sum is 43.

The square root of 2639986 is about 1624.8033727193. The cubic root of 2639986 is about 138.2082202919.

The spelling of 2639986 in words is "two million, six hundred thirty-nine thousand, nine hundred eighty-six".