2123864 has 8 divisors (see below), whose sum is σ = 3982260. Its totient is φ = 1061928.

The previous prime is 2123851. The next prime is 2123867. The reversal of 2123864 is 4683212.

It is a tau number, because it is divible by the number of its divisors (8).

It is a d-powerful number, because it can be written as 2¹¹ + 1 + 2¹³ + 3⁴ + 8⁷ + 6 + 4⁷ .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132734 + ... + 132749.

2^2123864 is an apocalyptic number.

It is an amenable number.

2123864 is a deficient number, since it is larger than the sum of its proper divisors (1858396).

2123864 is a wasteful number, since it uses less digits than its factorization.

2123864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265489 (or 265485 counting only the distinct ones).

The product of its digits is 2304, while the sum is 26.

The square root of 2123864 is about 1457.3482768371. The cubic root of 2123864 is about 128.5411658345.

The spelling of 2123864 in words is "two million, one hundred twenty-three thousand, eight hundred sixty-four".