40040065 has 24 divisors (see below), whose sum is σ = 53550504. Its totient is φ = 28569600.

The previous prime is 40040041. The next prime is 40040093. The reversal of 40040065 is 56004004.

It can be written as a sum of positive squares in 4 ways, for example, as 4981824 + 35058241 = 2232^2 + 5921^2 .

It is not a de Polignac number, because 40040065 - 2²³ = 31651457 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 62145 + ... + 62785.

It is an arithmetic number, because the mean of its divisors is an integer number (2231271).

Almost surely, 2^40040065 is an apocalyptic number.

It is an amenable number.

40040065 is a deficient number, since it is larger than the sum of its proper divisors (13510439).

40040065 is a wasteful number, since it uses less digits than its factorization.

40040065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 690 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 40040065 is about 6327.7219439542. The cubic root of 40040065 is about 342.1093348773.

Adding to 40040065 its reverse (56004004), we get a palindrome (96044069).

The spelling of 40040065 in words is "forty million, forty thousand, sixty-five".