2160639 has 24 divisors (see below), whose sum is σ = 3428880. Its totient is φ = 1302912.

The previous prime is 2160629. The next prime is 2160671. The reversal of 2160639 is 9360612.

It is a happy number.

2160639 is a `hidden beast` number, since 21 + 6 + 0 + 639 = 666.

It is not a de Polignac number, because 2160639 - 2⁸ = 2160383 is a prime.

2160639 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2160619) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6747 + ... + 7059.

It is an arithmetic number, because the mean of its divisors is an integer number (142870).

2^2160639 is an apocalyptic number.

2160639 is a deficient number, since it is larger than the sum of its proper divisors (1268241).

2160639 is a wasteful number, since it uses less digits than its factorization.

2160639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 2160639 is about 1469.9112218090. The cubic root of 2160639 is about 129.2788272170.

Subtracting from 2160639 its sum of digits (27), we obtain a palindrome (2160612).

The spelling of 2160639 in words is "two million, one hundred sixty thousand, six hundred thirty-nine".