40118681 has 8 divisors (see below), whose sum is σ = 41681664. Its totient is φ = 38572560.

The previous prime is 40118677. The next prime is 40118707. The reversal of 40118681 is 18681104.

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

It is a cyclic number.

It is not a de Polignac number, because 40118681 - 2² = 40118677 is a prime.

It is a super-2 number, since 2×40118681² = 3219017130359522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40118641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 746 + ... + 8988.

It is an arithmetic number, because the mean of its divisors is an integer number (5210208).

Almost surely, 2^40118681 is an apocalyptic number.

It is an amenable number.

40118681 is a deficient number, since it is larger than the sum of its proper divisors (1562983).

40118681 is a wasteful number, since it uses less digits than its factorization.

40118681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8431.

The product of its (nonzero) digits is 1536, while the sum is 29.

The square root of 40118681 is about 6333.9309279467. The cubic root of 40118681 is about 342.3330914596. Note that the first 3 decimals are identical.

Adding to 40118681 its reverse (18681104), we get a palindrome (58799785).

The spelling of 40118681 in words is "forty million, one hundred eighteen thousand, six hundred eighty-one".