40008281 has 4 divisors (see below), whose sum is σ = 42114000. Its totient is φ = 37902564.

The previous prime is 40008277. The next prime is 40008289. The reversal of 40008281 is 18280004.

40008281 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40008281 - 2² = 40008277 is a prime.

It is a super-2 number, since 2×40008281² = 3201325097149922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40008289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1052831 + ... + 1052868.

It is an arithmetic number, because the mean of its divisors is an integer number (10528500).

Almost surely, 2^40008281 is an apocalyptic number.

It is an amenable number.

40008281 is a deficient number, since it is larger than the sum of its proper divisors (2105719).

40008281 is a wasteful number, since it uses less digits than its factorization.

40008281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2105718.

The product of its (nonzero) digits is 512, while the sum is 23.

The square root of 40008281 is about 6325.2099569896. The cubic root of 40008281 is about 342.0187882249.

Adding to 40008281 its reverse (18280004), we get a palindrome (58288285).

The spelling of 40008281 in words is "forty million, eight thousand, two hundred eighty-one".