2193665 has 4 divisors (see below), whose sum is σ = 2632404. Its totient is φ = 1754928.

The previous prime is 2193661. The next prime is 2193673. The reversal of 2193665 is 5663912.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1256641 + 937024 = 1121^2 + 968^2 .

It is a cyclic number.

It is not a de Polignac number, because 2193665 - 2² = 2193661 is a prime.

It is a super-2 number, since 2×2193665² = 9624332264450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2193661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219362 + ... + 219371.

It is an arithmetic number, because the mean of its divisors is an integer number (658101).

2^2193665 is an apocalyptic number.

It is an amenable number.

2193665 is a deficient number, since it is larger than the sum of its proper divisors (438739).

2193665 is an equidigital number, since it uses as much as digits as its factorization.

2193665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438738.

The product of its digits is 9720, while the sum is 32.

The square root of 2193665 is about 1481.1026297998. The cubic root of 2193665 is about 129.9341875954.

The spelling of 2193665 in words is "two million, one hundred ninety-three thousand, six hundred sixty-five".