2178065 has 16 divisors (see below), whose sum is σ = 2790720. Its totient is φ = 1627200.

The previous prime is 2178049. The next prime is 2178073. The reversal of 2178065 is 5608712.

It is not a de Polignac number, because 2178065 - 2⁴ = 2178049 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9482 + ... + 9708.

It is an arithmetic number, because the mean of its divisors is an integer number (174420).

2^2178065 is an apocalyptic number.

It is an amenable number.

2178065 is a deficient number, since it is larger than the sum of its proper divisors (612655).

2178065 is a wasteful number, since it uses less digits than its factorization.

2178065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 352.

The product of its (nonzero) digits is 3360, while the sum is 29.

The square root of 2178065 is about 1475.8268868672. The cubic root of 2178065 is about 129.6254505027.

The spelling of 2178065 in words is "two million, one hundred seventy-eight thousand, sixty-five".