2679639 has 4 divisors (see below), whose sum is σ = 3572856. Its totient is φ = 1786424.

The previous prime is 2679619. The next prime is 2679641. The reversal of 2679639 is 9369762.

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 2679639 - 2⁷ = 2679511 is a prime.

It is a D-number.

It is a self number, because there is not a number n which added to its sum of digits gives 2679639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2679619) 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, 446604 + ... + 446609.

It is an arithmetic number, because the mean of its divisors is an integer number (893214).

2^2679639 is an apocalyptic number.

2679639 is a deficient number, since it is larger than the sum of its proper divisors (893217).

2679639 is an equidigital number, since it uses as much as digits as its factorization.

2679639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893216.

The product of its digits is 122472, while the sum is 42.

The square root of 2679639 is about 1636.9602927377. The cubic root of 2679639 is about 138.8967540672.

The spelling of 2679639 in words is "two million, six hundred seventy-nine thousand, six hundred thirty-nine".