2165745 has 8 divisors (see below), whose sum is σ = 3465216. Its totient is φ = 1155056.

The previous prime is 2165741. The next prime is 2165747. The reversal of 2165745 is 5475612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2165745 - 2² = 2165741 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2165741) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72177 + ... + 72206.

It is an arithmetic number, because the mean of its divisors is an integer number (433152).

2^2165745 is an apocalyptic number.

It is an amenable number.

2165745 is a deficient number, since it is larger than the sum of its proper divisors (1299471).

2165745 is a wasteful number, since it uses less digits than its factorization.

2165745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144391.

The product of its digits is 8400, while the sum is 30.

The square root of 2165745 is about 1471.6470364867. The cubic root of 2165745 is about 129.3805839033.

The spelling of 2165745 in words is "two million, one hundred sixty-five thousand, seven hundred forty-five".