2641639 has 36 divisors (see below), whose sum is σ = 3755160. Its totient is φ = 1834560.

The previous prime is 2641637. The next prime is 2641649. The reversal of 2641639 is 9361462.

It is not a de Polignac number, because 2641639 - 2¹ = 2641637 is a prime.

It is a Duffinian number.

2641639 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2641639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2641631) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 91077 + ... + 91105.

It is an arithmetic number, because the mean of its divisors is an integer number (104310).

2^2641639 is an apocalyptic number.

2641639 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

2641639 is a deficient number, since it is larger than the sum of its proper divisors (1113521).

2641639 is a wasteful number, since it uses less digits than its factorization.

2641639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80 (or 60 counting only the distinct ones).

The product of its digits is 7776, while the sum is 31.

The square root of 2641639 is about 1625.3119700537. The cubic root of 2641639 is about 138.2370601573.

The spelling of 2641639 in words is "two million, six hundred forty-one thousand, six hundred thirty-nine".