40681943 has 2 divisors, whose sum is σ = 40681944. Its totient is φ = 40681942.

The previous prime is 40681939. The next prime is 40682011. The reversal of 40681943 is 34918604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40681943 - 2² = 40681939 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40681343) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20340971 + 20340972.

It is an arithmetic number, because the mean of its divisors is an integer number (20340972).

Almost surely, 2^40681943 is an apocalyptic number.

40681943 is a deficient number, since it is larger than the sum of its proper divisors (1).

40681943 is an equidigital number, since it uses as much as digits as its factorization.

40681943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 40681943 is about 6378.2398042093. The cubic root of 40681943 is about 343.9277582886.

The spelling of 40681943 in words is "forty million, six hundred eighty-one thousand, nine hundred forty-three".