2189623 has 16 divisors (see below), whose sum is σ = 2451456. Its totient is φ = 1948320.

The previous prime is 2189609. The next prime is 2189633. The reversal of 2189623 is 3269812.

2189623 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2189623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2189633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26340 + ... + 26422.

It is an arithmetic number, because the mean of its divisors is an integer number (153216).

2^2189623 is an apocalyptic number.

2189623 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

2189623 is a deficient number, since it is larger than the sum of its proper divisors (261833).

2189623 is a wasteful number, since it uses less digits than its factorization.

2189623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 174.

The product of its digits is 5184, while the sum is 31.

The square root of 2189623 is about 1479.7374767167. The cubic root of 2189623 is about 129.8543338822.

The spelling of 2189623 in words is "two million, one hundred eighty-nine thousand, six hundred twenty-three".