2168729 has 4 divisors (see below), whose sum is σ = 2238720. Its totient is φ = 2098740.

The previous prime is 2168713. The next prime is 2168731. The reversal of 2168729 is 9278612.

It is a happy number.

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 2168729 - 2⁴ = 2168713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2168029) 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, 34949 + ... + 35010.

It is an arithmetic number, because the mean of its divisors is an integer number (559680).

2^2168729 is an apocalyptic number.

It is an amenable number.

2168729 is a deficient number, since it is larger than the sum of its proper divisors (69991).

2168729 is an equidigital number, since it uses as much as digits as its factorization.

2168729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69990.

The product of its digits is 12096, while the sum is 35.

The square root of 2168729 is about 1472.6605175668. The cubic root of 2168729 is about 129.4399775509.

The spelling of 2168729 in words is "two million, one hundred sixty-eight thousand, seven hundred twenty-nine".