40318939 has 2 divisors, whose sum is σ = 40318940. Its totient is φ = 40318938.

The previous prime is 40318919. The next prime is 40318981. The reversal of 40318939 is 93981304.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40318939 - 2¹⁵ = 40286171 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 40318898 and 40318907.

It is not a weakly prime, because it can be changed into another prime (40318909) 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, 20159469 + 20159470.

It is an arithmetic number, because the mean of its divisors is an integer number (20159470).

Almost surely, 2^40318939 is an apocalyptic number.

40318939 is a deficient number, since it is larger than the sum of its proper divisors (1).

40318939 is an equidigital number, since it uses as much as digits as its factorization.

40318939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 40318939 is about 6349.7196001083. The cubic root of 40318939 is about 342.9017474789.

The spelling of 40318939 in words is "forty million, three hundred eighteen thousand, nine hundred thirty-nine".