2143664 has 10 divisors (see below), whose sum is σ = 4153380. Its totient is φ = 1071824.

The previous prime is 2143627. The next prime is 2143667. The reversal of 2143664 is 4663412.

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 as a sum of consecutive naturals, namely, 66974 + ... + 67005.

It is an arithmetic number, because the mean of its divisors is an integer number (415338).

2^2143664 is an apocalyptic number.

It is an amenable number.

2143664 is a deficient number, since it is larger than the sum of its proper divisors (2009716).

2143664 is a wasteful number, since it uses less digits than its factorization.

2143664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133987 (or 133981 counting only the distinct ones).

The product of its digits is 3456, while the sum is 26.

The square root of 2143664 is about 1464.1256776657. The cubic root of 2143664 is about 128.9393782024.

The spelling of 2143664 in words is "two million, one hundred forty-three thousand, six hundred sixty-four".