40307231 has 2 divisors, whose sum is σ = 40307232. Its totient is φ = 40307230.

The previous prime is 40307177. The next prime is 40307233. The reversal of 40307231 is 13270304.

40307231 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 40307231 - 2⁶ = 40307167 is a prime.

It is a super-2 number, since 2×40307231² = 3249345741774722, which contains 22 as substring.

Together with 40307233, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40307233) 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, 20153615 + 20153616.

It is an arithmetic number, because the mean of its divisors is an integer number (20153616).

Almost surely, 2^40307231 is an apocalyptic number.

40307231 is a deficient number, since it is larger than the sum of its proper divisors (1).

40307231 is an equidigital number, since it uses as much as digits as its factorization.

40307231 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 20.

The square root of 40307231 is about 6348.7976026961. The cubic root of 40307231 is about 342.8685531338.

Adding to 40307231 its reverse (13270304), we get a palindrome (53577535).

The spelling of 40307231 in words is "forty million, three hundred seven thousand, two hundred thirty-one".