4040665 has 8 divisors (see below), whose sum is σ = 4862088. Its totient is φ = 3223680.

The previous prime is 4040653. The next prime is 4040669. The reversal of 4040665 is 5660404.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 24649 + 4016016 = 157^2 + 2004^2 .

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

It is not a de Polignac number, because 4040665 - 2¹⁷ = 3909593 is a prime.

It is a Duffinian number.

4040665 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4040669) 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, 1429 + ... + 3181.

It is an arithmetic number, because the mean of its divisors is an integer number (607761).

Almost surely, 2^4040665 is an apocalyptic number.

It is an amenable number.

4040665 is a deficient number, since it is larger than the sum of its proper divisors (821423).

4040665 is a wasteful number, since it uses less digits than its factorization.

4040665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2219.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 4040665 is about 2010.1405423502. The cubic root of 4040665 is about 159.2762230426.

The spelling of 4040665 in words is "four million, forty thousand, six hundred sixty-five".