2161723 has 8 divisors (see below), whose sum is σ = 2252160. Its totient is φ = 2072640.

The previous prime is 2161699. The next prime is 2161729. The reversal of 2161723 is 3271612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2161723 - 2¹³ = 2153531 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2161694 and 2161703.

It is not an unprimeable number, because it can be changed into a prime (2161729) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3993 + ... + 4501.

It is an arithmetic number, because the mean of its divisors is an integer number (281520).

2^2161723 is an apocalyptic number.

2161723 is a deficient number, since it is larger than the sum of its proper divisors (90437).

2161723 is a wasteful number, since it uses less digits than its factorization.

2161723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677.

The product of its digits is 504, while the sum is 22.

The square root of 2161723 is about 1470.2799053242. The cubic root of 2161723 is about 129.3004434795.

The spelling of 2161723 in words is "two million, one hundred sixty-one thousand, seven hundred twenty-three".