2129723 has 4 divisors (see below), whose sum is σ = 2165880. Its totient is φ = 2093568.

The previous prime is 2129719. The next prime is 2129741. The reversal of 2129723 is 3279212.

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

It is a cyclic number.

It is not a de Polignac number, because 2129723 - 2² = 2129719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2129692 and 2129701.

It is not an unprimeable number, because it can be changed into a prime (2129713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17990 + ... + 18107.

It is an arithmetic number, because the mean of its divisors is an integer number (541470).

2^2129723 is an apocalyptic number.

2129723 is a deficient number, since it is larger than the sum of its proper divisors (36157).

2129723 is an equidigital number, since it uses as much as digits as its factorization.

2129723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36156.

The product of its digits is 1512, while the sum is 26.

The square root of 2129723 is about 1459.3570502108. The cubic root of 2129723 is about 128.6592573909.

The spelling of 2129723 in words is "two million, one hundred twenty-nine thousand, seven hundred twenty-three".