2639655 has 16 divisors (see below), whose sum is σ = 4692960. Its totient is φ = 1407744.

The previous prime is 2639639. The next prime is 2639669. The reversal of 2639655 is 5569362.

It is not a de Polignac number, because 2639655 - 2⁴ = 2639639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9642 + ... + 9911.

It is an arithmetic number, because the mean of its divisors is an integer number (293310).

2^2639655 is an apocalyptic number.

2639655 is a deficient number, since it is larger than the sum of its proper divisors (2053305).

2639655 is a wasteful number, since it uses less digits than its factorization.

2639655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19567 (or 19561 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 2639655 is about 1624.7015110475. The cubic root of 2639655 is about 138.2024438935.

The spelling of 2639655 in words is "two million, six hundred thirty-nine thousand, six hundred fifty-five".