2159689 has 4 divisors (see below), whose sum is σ = 2468224. Its totient is φ = 1851156.

The previous prime is 2159681. The next prime is 2159701. The reversal of 2159689 is 9869512.

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 2159689 - 2³ = 2159681 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2159681) 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, 154257 + ... + 154270.

It is an arithmetic number, because the mean of its divisors is an integer number (617056).

2^2159689 is an apocalyptic number.

It is an amenable number.

2159689 is a deficient number, since it is larger than the sum of its proper divisors (308535).

2159689 is an equidigital number, since it uses as much as digits as its factorization.

2159689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 308534.

The product of its digits is 38880, while the sum is 40.

The square root of 2159689 is about 1469.5880375126. The cubic root of 2159689 is about 129.2598771302.

The spelling of 2159689 in words is "two million, one hundred fifty-nine thousand, six hundred eighty-nine".