40673681 has 8 divisors (see below), whose sum is σ = 41769000. Its totient is φ = 39583360.

The previous prime is 40673671. The next prime is 40673687. The reversal of 40673681 is 18637604.

It can be written as a sum of positive squares in 4 ways, for example, as 7507600 + 33166081 = 2740^2 + 5759^2 .

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 40673681 - 2⁶ = 40673617 is a prime.

It is a super-2 number, since 2×40673681² = 3308696652179522, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (40673687) 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, 19895 + ... + 21843.

It is an arithmetic number, because the mean of its divisors is an integer number (5221125).

Almost surely, 2^40673681 is an apocalyptic number.

40673681 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

40673681 is a deficient number, since it is larger than the sum of its proper divisors (1095319).

40673681 is a wasteful number, since it uses less digits than its factorization.

40673681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2499.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 40673681 is about 6377.5921004718. The cubic root of 40673681 is about 343.9044742194.

The spelling of 40673681 in words is "forty million, six hundred seventy-three thousand, six hundred eighty-one".