2123644 has 6 divisors (see below), whose sum is σ = 3716384. Its totient is φ = 1061820.

The previous prime is 2123617. The next prime is 2123663. The reversal of 2123644 is 4463212.

It is a happy number.

2123644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a d-powerful number, because it can be written as 2⁷ + 1 + 2²¹ + 3⁷ + 6⁵ + 4² + 4⁷ .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 265452 + ... + 265459.

2^2123644 is an apocalyptic number.

It is an amenable number.

2123644 is a deficient number, since it is larger than the sum of its proper divisors (1592740).

2123644 is a wasteful number, since it uses less digits than its factorization.

2123644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 530915 (or 530913 counting only the distinct ones).

The product of its digits is 1152, while the sum is 22.

The square root of 2123644 is about 1457.2727953269. The cubic root of 2123644 is about 128.5367273781.

Adding to 2123644 its reverse (4463212), we get a palindrome (6586856).

The spelling of 2123644 in words is "two million, one hundred twenty-three thousand, six hundred forty-four".