2123659 has 4 divisors (see below), whose sum is σ = 2216016. Its totient is φ = 2031304.

The previous prime is 2123617. The next prime is 2123663. The reversal of 2123659 is 9563212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2123659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2123669) 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, 46144 + ... + 46189.

It is an arithmetic number, because the mean of its divisors is an integer number (554004).

2^2123659 is an apocalyptic number.

2123659 is a deficient number, since it is larger than the sum of its proper divisors (92357).

2123659 is an equidigital number, since it uses as much as digits as its factorization.

2123659 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92356.

The product of its digits is 3240, while the sum is 28.

The square root of 2123659 is about 1457.2779419177. The cubic root of 2123659 is about 128.5370300099.

The spelling of 2123659 in words is "two million, one hundred twenty-three thousand, six hundred fifty-nine".