40040805 has 64 divisors (see below), whose sum is σ = 76640256. Its totient is φ = 17472000.

The previous prime is 40040789. The next prime is 40040807. The reversal of 40040805 is 50804004.

It is not a de Polignac number, because 40040805 - 2⁴ = 40040789 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040807) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 305590 + ... + 305720.

It is an arithmetic number, because the mean of its divisors is an integer number (1197504).

Almost surely, 2^40040805 is an apocalyptic number.

It is an amenable number.

40040805 is a deficient number, since it is larger than the sum of its proper divisors (36599451).

40040805 is a wasteful number, since it uses less digits than its factorization.

40040805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 40040805 is about 6327.7804165442. The cubic root of 40040805 is about 342.1114424276. Note that the first 3 decimals are identical.

Adding to 40040805 its reverse (50804004), we get a palindrome (90844809).

The spelling of 40040805 in words is "forty million, forty thousand, eight hundred five".