2143638 has 64 divisors (see below), whose sum is σ = 5598720. Its totient is φ = 595296.

The previous prime is 2143627. The next prime is 2143667. The reversal of 2143638 is 8363412.

It is a happy number.

2143638 is a `hidden beast` number, since 21 + 4 + 3 + 638 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19981 + ... + 20087.

It is an arithmetic number, because the mean of its divisors is an integer number (87480).

2^2143638 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2143638, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2799360).

2143638 is an abundant number, since it is smaller than the sum of its proper divisors (3455082).

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

2143638 is a wasteful number, since it uses less digits than its factorization.

2143638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 172 counting only the distinct ones).

The product of its digits is 3456, while the sum is 27.

The square root of 2143638 is about 1464.1167986196. The cubic root of 2143638 is about 128.9388569084.

The spelling of 2143638 in words is "two million, one hundred forty-three thousand, six hundred thirty-eight".