2123775 has 18 divisors (see below), whose sum is σ = 3804320. Its totient is φ = 1132560.

The previous prime is 2123773. The next prime is 2123777. The reversal of 2123775 is 5773212.

It is an interprime number because it is at equal distance from previous prime (2123773) and next prime (2123777).

It is not a de Polignac number, because 2123775 - 2¹ = 2123773 is a prime.

It is a d-powerful number, because it can be written as 2¹⁴ + 1 + 2¹⁸ + 3¹³ + 7⁶ + 7⁶ + 5⁶ .

2123775 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123773) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4495 + ... + 4944.

2^2123775 is an apocalyptic number.

2123775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2123775 is a deficient number, since it is larger than the sum of its proper divisors (1680545).

2123775 is a wasteful number, since it uses less digits than its factorization.

2123775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9455 (or 9447 counting only the distinct ones).

The product of its digits is 2940, while the sum is 27.

The square root of 2123775 is about 1457.3177416061. The cubic root of 2123775 is about 128.5393703141.

Adding to 2123775 its reverse (5773212), we get a palindrome (7896987).

It can be divided in two parts, 21237 and 75, that added together give a palindrome (21312).

The spelling of 2123775 in words is "two million, one hundred twenty-three thousand, seven hundred seventy-five".