40431431 has 2 divisors, whose sum is σ = 40431432. Its totient is φ = 40431430.

The previous prime is 40431407. The next prime is 40431437. The reversal of 40431431 is 13413404.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 40431431 - 2⁶ = 40431367 is a prime.

It is a super-2 number, since 2×40431431² = 3269401225415522, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40431437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20215715 + 20215716.

It is an arithmetic number, because the mean of its divisors is an integer number (20215716).

Almost surely, 2^40431431 is an apocalyptic number.

40431431 is a deficient number, since it is larger than the sum of its proper divisors (1).

40431431 is an equidigital number, since it uses as much as digits as its factorization.

40431431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 40431431 is about 6358.5714590622. The cubic root of 40431431 is about 343.2203560998.

Adding to 40431431 its reverse (13413404), we get a palindrome (53844835).

The spelling of 40431431 in words is "forty million, four hundred thirty-one thousand, four hundred thirty-one".