2166729 has 4 divisors (see below), whose sum is σ = 2888976. Its totient is φ = 1444484.

The previous prime is 2166721. The next prime is 2166763. The reversal of 2166729 is 9276612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2166729 - 2³ = 2166721 is a prime.

It is a D-number.

2166729 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 2166729.

It is not an unprimeable number, because it can be changed into a prime (2166721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361119 + ... + 361124.

It is an arithmetic number, because the mean of its divisors is an integer number (722244).

2^2166729 is an apocalyptic number.

It is an amenable number.

2166729 is a deficient number, since it is larger than the sum of its proper divisors (722247).

2166729 is an equidigital number, since it uses as much as digits as its factorization.

2166729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 722246.

The product of its digits is 9072, while the sum is 33.

The square root of 2166729 is about 1471.9813178162. The cubic root of 2166729 is about 129.4001755016.

The spelling of 2166729 in words is "two million, one hundred sixty-six thousand, seven hundred twenty-nine".