2143665 has 40 divisors (see below), whose sum is σ = 3949440. Its totient is φ = 1111968.

The previous prime is 2143627. The next prime is 2143667. The reversal of 2143665 is 5663412.

It is not a de Polignac number, because 2143665 - 2¹⁰ = 2142641 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (2143667) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 27096 + ... + 27174.

It is an arithmetic number, because the mean of its divisors is an integer number (98736).

2^2143665 is an apocalyptic number.

It is an amenable number.

2143665 is a deficient number, since it is larger than the sum of its proper divisors (1805775).

2143665 is an equidigital number, since it uses as much as digits as its factorization.

2143665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163 (or 154 counting only the distinct ones).

The product of its digits is 4320, while the sum is 27.

The square root of 2143665 is about 1464.1260191664. The cubic root of 2143665 is about 128.9393982521.

The spelling of 2143665 in words is "two million, one hundred forty-three thousand, six hundred sixty-five".