9775665 has 24 divisors (see below), whose sum is σ = 17108520. Its totient is φ = 5163264.

The previous prime is 9775637. The next prime is 9775673. The reversal of 9775665 is 5665779.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2614689 + 7160976 = 1617^2 + 2676^2 .

It is not a de Polignac number, because 9775665 - 2⁷ = 9775537 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 9775665.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3909 + ... + 5901.

It is an arithmetic number, because the mean of its divisors is an integer number (712855).

Almost surely, 2^9775665 is an apocalyptic number.

It is an amenable number.

9775665 is a deficient number, since it is larger than the sum of its proper divisors (7332855).

9775665 is a wasteful number, since it uses less digits than its factorization.

It is an anagram of its base 11 representation: 9775665 = (5577669)₁₁.

9775665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2113 (or 2110 counting only the distinct ones).

The product of its digits is 396900, while the sum is 45.

The square root of 9775665 is about 3126.6059873288. The cubic root of 9775665 is about 213.8202190556.

It can be divided in two parts, 9775 and 665, that added together give a triangular number (10440 = T₁₄₄).

The spelling of 9775665 in words is "nine million, seven hundred seventy-five thousand, six hundred sixty-five".