2172923 has 4 divisors (see below), whose sum is σ = 2300760. Its totient is φ = 2045088.

The previous prime is 2172917. The next prime is 2172943. The reversal of 2172923 is 3292712.

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 2172923 - 2¹⁰ = 2171899 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2172892 and 2172901.

It is not an unprimeable number, because it can be changed into a prime (2172943) 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, 63893 + ... + 63926.

It is an arithmetic number, because the mean of its divisors is an integer number (575190).

2^2172923 is an apocalyptic number.

2172923 is a deficient number, since it is larger than the sum of its proper divisors (127837).

2172923 is a wasteful number, since it uses less digits than its factorization.

2172923 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127836.

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

The square root of 2172923 is about 1474.0837832362. The cubic root of 2172923 is about 129.5233630572.

The spelling of 2172923 in words is "two million, one hundred seventy-two thousand, nine hundred twenty-three".