2639993 has 12 divisors (see below), whose sum is σ = 2852928. Its totient is φ = 2441880.

The previous prime is 2639971. The next prime is 2639999. The reversal of 2639993 is 3999362.

It is a happy number.

It is not a de Polignac number, because 2639993 - 2²⁰ = 1591417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2639993.

It is not an unprimeable number, because it can be changed into a prime (2639999) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25580 + ... + 25682.

It is an arithmetic number, because the mean of its divisors is an integer number (237744).

2^2639993 is an apocalyptic number.

It is an amenable number.

2639993 is a deficient number, since it is larger than the sum of its proper divisors (212935).

2639993 is a wasteful number, since it uses less digits than its factorization.

2639993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 193 counting only the distinct ones).

The product of its digits is 78732, while the sum is 41.

The square root of 2639993 is about 1624.8055268247. The cubic root of 2639993 is about 138.2083424462.

The spelling of 2639993 in words is "two million, six hundred thirty-nine thousand, nine hundred ninety-three".