40405231 has 2 divisors, whose sum is σ = 40405232. Its totient is φ = 40405230.

The previous prime is 40405219. The next prime is 40405237. The reversal of 40405231 is 13250404.

40405231 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40405231 - 2¹⁵ = 40372463 is a prime.

It is a super-2 number, since 2×40405231² = 3265165384326722, which contains 22 as substring.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 40405199 and 40405208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40405237) 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 as a sum of consecutive naturals, namely, 20202615 + 20202616.

It is an arithmetic number, because the mean of its divisors is an integer number (20202616).

Almost surely, 2^40405231 is an apocalyptic number.

40405231 is a deficient number, since it is larger than the sum of its proper divisors (1).

40405231 is an equidigital number, since it uses as much as digits as its factorization.

40405231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 40405231 is about 6356.5109140156. The cubic root of 40405231 is about 343.1462032588.

Adding to 40405231 its reverse (13250404), we get a palindrome (53655635).

The spelling of 40405231 in words is "forty million, four hundred five thousand, two hundred thirty-one".