2163864 has 32 divisors (see below), whose sum is σ = 5598000. Its totient is φ = 696192.

The previous prime is 2163859. The next prime is 2163869. The reversal of 2163864 is 4683612.

It is an interprime number because it is at equal distance from previous prime (2163859) and next prime (2163869).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2163869) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 859 + ... + 2250.

2^2163864 is an apocalyptic number.

2163864 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

2163864 is an abundant number, since it is smaller than the sum of its proper divisors (3434136).

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

2163864 is a wasteful number, since it uses less digits than its factorization.

2163864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3147 (or 3143 counting only the distinct ones).

The product of its digits is 6912, while the sum is 30.

The square root of 2163864 is about 1471.0078177902. The cubic root of 2163864 is about 129.3431163701.

The spelling of 2163864 in words is "two million, one hundred sixty-three thousand, eight hundred sixty-four".