2165445 has 12 divisors (see below), whose sum is σ = 3753516. Its totient is φ = 1154880.

The previous prime is 2165413. The next prime is 2165453. The reversal of 2165445 is 5445612.

2165445 is a `hidden beast` number, since 2 + 1 + 654 + 4 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1179396 + 986049 = 1086^2 + 993^2 .

It is not a de Polignac number, because 2165445 - 2⁵ = 2165413 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24016 + ... + 24105.

It is an arithmetic number, because the mean of its divisors is an integer number (312793).

2^2165445 is an apocalyptic number.

It is an amenable number.

2165445 is a deficient number, since it is larger than the sum of its proper divisors (1588071).

2165445 is a wasteful number, since it uses less digits than its factorization.

2165445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48132 (or 48129 counting only the distinct ones).

The product of its digits is 4800, while the sum is 27.

The square root of 2165445 is about 1471.5451063423. The cubic root of 2165445 is about 129.3746096747.

The spelling of 2165445 in words is "two million, one hundred sixty-five thousand, four hundred forty-five".