2163640 has 16 divisors (see below), whose sum is σ = 4868280. Its totient is φ = 865440.

The previous prime is 2163613. The next prime is 2163653. The reversal of 2163640 is 463612.

It is a d-powerful number, because it can be written as 2²¹ + 1 + 6 + 3⁶ + 6³ + 4⁸ + 0 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27006 + ... + 27085.

2^2163640 is an apocalyptic number.

2163640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2163640 is an abundant number, since it is smaller than the sum of its proper divisors (2704640).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2163640 is a wasteful number, since it uses less digits than its factorization.

2163640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54102 (or 54098 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 2163640 is about 1470.9316775432. The cubic root of 2163640 is about 129.3386530800.

The spelling of 2163640 in words is "two million, one hundred sixty-three thousand, six hundred forty".