2165975 has 12 divisors (see below), whose sum is σ = 3069744. Its totient is φ = 1485120.

The previous prime is 2165971. The next prime is 2166007. The reversal of 2165975 is 5795612.

It is not a de Polignac number, because 2165975 - 2² = 2165971 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2165971) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6014 + ... + 6363.

It is an arithmetic number, because the mean of its divisors is an integer number (255812).

2^2165975 is an apocalyptic number.

2165975 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2165975 is a deficient number, since it is larger than the sum of its proper divisors (903769).

2165975 is a wasteful number, since it uses less digits than its factorization.

2165975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12394 (or 12389 counting only the distinct ones).

The product of its digits is 18900, while the sum is 35.

The square root of 2165975 is about 1471.7251781498. The cubic root of 2165975 is about 129.3851637717.

The spelling of 2165975 in words is "two million, one hundred sixty-five thousand, nine hundred seventy-five".