40033681 has 4 divisors (see below), whose sum is σ = 40046832. Its totient is φ = 40020532.

The previous prime is 40033649. The next prime is 40033723. The reversal of 40033681 is 18633004.

40033681 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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40033681 - 2⁵ = 40033649 is a prime.

It is a super-2 number, since 2×40033681² = 3205391228819522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40033621) 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, 606 + ... + 8968.

It is an arithmetic number, because the mean of its divisors is an integer number (10011708).

Almost surely, 2^40033681 is an apocalyptic number.

It is an amenable number.

40033681 is a deficient number, since it is larger than the sum of its proper divisors (13151).

40033681 is an equidigital number, since it uses as much as digits as its factorization.

40033681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13150.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 40033681 is about 6327.2174769009. The cubic root of 40033681 is about 342.0911519058.

Adding to 40033681 its reverse (18633004), we get a palindrome (58666685).

The spelling of 40033681 in words is "forty million, thirty-three thousand, six hundred eighty-one".