2112845 has 32 divisors (see below), whose sum is σ = 3172608. Its totient is φ = 1317888.

The previous prime is 2112841. The next prime is 2112863. The reversal of 2112845 is 5482112.

It is a cyclic number.

It is not a de Polignac number, because 2112845 - 2² = 2112841 is a prime.

It is a super-2 number, since 2×2112845² = 8928227988050, which contains 22 as substring.

It is a d-powerful number, because it can be written as 2 + 1 + 1 + 2²⁰ + 8² + 4¹⁰ + 5⁶ .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 2112845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112841) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31502 + ... + 31568.

It is an arithmetic number, because the mean of its divisors is an integer number (99144).

2^2112845 is an apocalyptic number.

It is an amenable number.

2112845 is a deficient number, since it is larger than the sum of its proper divisors (1059763).

2112845 is a wasteful number, since it uses less digits than its factorization.

2112845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149.

The product of its digits is 640, while the sum is 23.

The square root of 2112845 is about 1453.5628641376. The cubic root of 2112845 is about 128.3184818180.

Adding to 2112845 its reverse (5482112), we get a palindrome (7594957).

It can be divided in two parts, 21 and 12845, that multiplied together give a triangular number (269745 = T₇₃₄).

The spelling of 2112845 in words is "two million, one hundred twelve thousand, eight hundred forty-five".