40438081 has 2 divisors, whose sum is σ = 40438082. Its totient is φ = 40438080.

The previous prime is 40438063. The next prime is 40438141. The reversal of 40438081 is 18083404.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 35509681 + 4928400 = 5959^2 + 2220^2 .

It is a cyclic number.

It is not a de Polignac number, because 40438081 - 2⁷ = 40437953 is a prime.

It is a super-2 number, since 2×40438081² = 3270476789925122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (40438031) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20219040 + 20219041.

It is an arithmetic number, because the mean of its divisors is an integer number (20219041).

Almost surely, 2^40438081 is an apocalyptic number.

It is an amenable number.

40438081 is a deficient number, since it is larger than the sum of its proper divisors (1).

40438081 is an equidigital number, since it uses as much as digits as its factorization.

40438081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 40438081 is about 6359.0943537582. The cubic root of 40438081 is about 343.2391722385.

The spelling of 40438081 in words is "forty million, four hundred thirty-eight thousand, eighty-one".