2145775 has 6 divisors (see below), whose sum is σ = 2660792. Its totient is φ = 1716600.

The previous prime is 2145769. The next prime is 2145779. The reversal of 2145775 is 5775412.

It is not a de Polignac number, because 2145775 - 2⁹ = 2145263 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2145779) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 42891 + ... + 42940.

2^2145775 is an apocalyptic number.

2145775 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2145775 is a deficient number, since it is larger than the sum of its proper divisors (515017).

2145775 is an equidigital number, since it uses as much as digits as its factorization.

2145775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85841 (or 85836 counting only the distinct ones).

The product of its digits is 9800, while the sum is 31.

The square root of 2145775 is about 1464.8464083309. The cubic root of 2145775 is about 128.9816892064.

It can be divided in two parts, 21 and 45775, that added together give a square (45796 = 214²).

The spelling of 2145775 in words is "two million, one hundred forty-five thousand, seven hundred seventy-five".