4087665 has 20 divisors (see below), whose sum is σ = 7328244. Its totient is φ = 2179872.

The previous prime is 4087663. The next prime is 4087673. The reversal of 4087665 is 5667804.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1774224 + 2313441 = 1332^2 + 1521^2 .

It is not a de Polignac number, because 4087665 - 2¹ = 4087663 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4087661) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 4642 + ... + 5451.

Almost surely, 2^4087665 is an apocalyptic number.

4087665 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4087665 is a deficient number, since it is larger than the sum of its proper divisors (3240579).

4087665 is a wasteful number, since it uses less digits than its factorization.

4087665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10110 (or 10101 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 4087665 is about 2021.7974676015. The cubic root of 4087665 is about 159.8913976554.

The spelling of 4087665 in words is "four million, eighty-seven thousand, six hundred sixty-five".