2189923 has 4 divisors (see below), whose sum is σ = 2318760. Its totient is φ = 2061088.

The previous prime is 2189881. The next prime is 2189939. The reversal of 2189923 is 3299812.

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 2189923 - 2¹³ = 2181731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2189323) 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, 64393 + ... + 64426.

It is an arithmetic number, because the mean of its divisors is an integer number (579690).

2^2189923 is an apocalyptic number.

2189923 is a deficient number, since it is larger than the sum of its proper divisors (128837).

2189923 is a wasteful number, since it uses less digits than its factorization.

2189923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128836.

The product of its digits is 7776, while the sum is 34.

The square root of 2189923 is about 1479.8388425771. The cubic root of 2189923 is about 129.8602640540.

The spelling of 2189923 in words is "two million, one hundred eighty-nine thousand, nine hundred twenty-three".