2639959 has 4 divisors (see below), whose sum is σ = 3017104. Its totient is φ = 2262816.

The previous prime is 2639953. The next prime is 2639969. The reversal of 2639959 is 9599362.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2639959 - 2⁵ = 2639927 is a prime.

It is a Duffinian number.

2639959 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2639953) 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, 188562 + ... + 188575.

It is an arithmetic number, because the mean of its divisors is an integer number (754276).

2^2639959 is an apocalyptic number.

2639959 is a deficient number, since it is larger than the sum of its proper divisors (377145).

2639959 is an equidigital number, since it uses as much as digits as its factorization.

2639959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 377144.

The product of its digits is 131220, while the sum is 43.

The square root of 2639959 is about 1624.7950640004. The cubic root of 2639959 is about 138.2077491234.

The spelling of 2639959 in words is "two million, six hundred thirty-nine thousand, nine hundred fifty-nine".