40012081 has 8 divisors (see below), whose sum is σ = 42213600. Its totient is φ = 37820160.

The previous prime is 40012051. The next prime is 40012097. The reversal of 40012081 is 18021004.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40012081 is a prime.

It is a super-2 number, since 2×40012081² = 3201933251901122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40012001) 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, 7185 + ... + 11473.

It is an arithmetic number, because the mean of its divisors is an integer number (5276700).

Almost surely, 2^40012081 is an apocalyptic number.

It is an amenable number.

40012081 is a deficient number, since it is larger than the sum of its proper divisors (2201519).

40012081 is a wasteful number, since it uses less digits than its factorization.

40012081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4799.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 40012081 is about 6325.5103351429. The cubic root of 40012081 is about 342.0296162353.

Adding to 40012081 its reverse (18021004), we get a palindrome (58033085).

The spelling of 40012081 in words is "forty million, twelve thousand, eighty-one".