2180965 has 8 divisors (see below), whose sum is σ = 2688120. Its totient is φ = 1697472.

The previous prime is 2180963. The next prime is 2180993. The reversal of 2180965 is 5690812.

It can be written as a sum of positive squares in 4 ways, for example, as 124609 + 2056356 = 353^2 + 1434^2 .

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 2180965 - 2¹ = 2180963 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2180963) 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, 5710 + ... + 6079.

It is an arithmetic number, because the mean of its divisors is an integer number (336015).

2^2180965 is an apocalyptic number.

It is an amenable number.

2180965 is a deficient number, since it is larger than the sum of its proper divisors (507155).

2180965 is a wasteful number, since it uses less digits than its factorization.

2180965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11831.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 2180965 is about 1476.8090601022. The cubic root of 2180965 is about 129.6829552286.

The spelling of 2180965 in words is "two million, one hundred eighty thousand, nine hundred sixty-five".