40007081 has 4 divisors (see below), whose sum is σ = 41297664. Its totient is φ = 38716500.

The previous prime is 40007063. The next prime is 40007083. The reversal of 40007081 is 18070004.

It is a happy number.

40007081 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 40007081 - 2⁶ = 40007017 is a prime.

It is a super-2 number, since 2×40007081² = 3201133060281122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40007083) 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, 645245 + ... + 645306.

It is an arithmetic number, because the mean of its divisors is an integer number (10324416).

Almost surely, 2^40007081 is an apocalyptic number.

It is an amenable number.

40007081 is a deficient number, since it is larger than the sum of its proper divisors (1290583).

40007081 is a wasteful number, since it uses less digits than its factorization.

40007081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1290582.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 40007081 is about 6325.1150977670. The cubic root of 40007081 is about 342.0153687108.

Adding to 40007081 its reverse (18070004), we get a palindrome (58077085).

The spelling of 40007081 in words is "forty million, seven thousand, eighty-one".