1965665 has 8 divisors (see below), whose sum is σ = 2540328. Its totient is φ = 1451520.

The previous prime is 1965661. The next prime is 1965673. The reversal of 1965665 is 5665691.

It can be written as a sum of positive squares in 4 ways, for example, as 8464 + 1957201 = 92^2 + 1399^2 .

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

It is not a de Polignac number, because 1965665 - 2² = 1965661 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1965661) 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, 15056 + ... + 15185.

It is an arithmetic number, because the mean of its divisors is an integer number (317541).

2^1965665 is an apocalyptic number.

It is an amenable number.

1965665 is a deficient number, since it is larger than the sum of its proper divisors (574663).

1965665 is a wasteful number, since it uses less digits than its factorization.

1965665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30259.

The product of its digits is 48600, while the sum is 38.

The square root of 1965665 is about 1402.0217544675. The cubic root of 1965665 is about 125.2669494979.

The spelling of 1965665 in words is "one million, nine hundred sixty-five thousand, six hundred sixty-five".