40685431 has 2 divisors, whose sum is σ = 40685432. Its totient is φ = 40685430.

The previous prime is 40685401. The next prime is 40685467. The reversal of 40685431 is 13458604.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40685431 - 2¹⁵ = 40652663 is a prime.

It is a super-2 number, since 2×40685431² = 3310608591311522, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 40685393 and 40685402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40685401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20342715 + 20342716.

It is an arithmetic number, because the mean of its divisors is an integer number (20342716).

Almost surely, 2^40685431 is an apocalyptic number.

40685431 is a deficient number, since it is larger than the sum of its proper divisors (1).

40685431 is an equidigital number, since it uses as much as digits as its factorization.

40685431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 40685431 is about 6378.5132280180. The cubic root of 40685431 is about 343.9375872663.

The spelling of 40685431 in words is "forty million, six hundred eighty-five thousand, four hundred thirty-one".