40065 has 8 divisors (see below), whose sum is σ = 64128. Its totient is φ = 21360.

The previous prime is 40063. The next prime is 40087. The reversal of 40065 is 56004.

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

It is not a de Polignac number, because 40065 - 2¹ = 40063 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15), and also a Moran number because the ratio is a prime number: 2671 = 40065 / (4 + 0 + 0 + 6 + 5).

It is not an unprimeable number, because it can be changed into a prime (40063) 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, 1321 + ... + 1350.

It is an arithmetic number, because the mean of its divisors is an integer number (8016).

2⁴⁰⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

40065 is a deficient number, since it is larger than the sum of its proper divisors (24063).

40065 is a wasteful number, since it uses less digits than its factorization.

40065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2679.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 40065 is about 200.1624340380. The cubic root of 40065 is about 34.2180336478.

Adding to 40065 its reverse (56004), we get a palindrome (96069).

It can be divided in two parts, 400 and 65, that added together give a triangular number (465 = T₃₀).

The spelling of 40065 in words is "forty thousand, sixty-five".