40781893 has 2 divisors, whose sum is σ = 40781894. Its totient is φ = 40781892.

The previous prime is 40781887. The next prime is 40781911. The reversal of 40781893 is 39818704.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 40742689 + 39204 = 6383^2 + 198^2 .

It is a cyclic number.

It is not a de Polignac number, because 40781893 - 2²⁵ = 7227461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40781843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20390946 + 20390947.

It is an arithmetic number, because the mean of its divisors is an integer number (20390947).

Almost surely, 2^40781893 is an apocalyptic number.

It is an amenable number.

40781893 is a deficient number, since it is larger than the sum of its proper divisors (1).

40781893 is an equidigital number, since it uses as much as digits as its factorization.

40781893 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 40.

The square root of 40781893 is about 6386.0702313708. The cubic root of 40781893 is about 344.2091891744.

The spelling of 40781893 in words is "forty million, seven hundred eighty-one thousand, eight hundred ninety-three".