40421947 has 2 divisors, whose sum is σ = 40421948. Its totient is φ = 40421946.

The previous prime is 40421939. The next prime is 40421957. The reversal of 40421947 is 74912404.

40421947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40421947 - 2³ = 40421939 is a prime.

It is not a weakly prime, because it can be changed into another prime (40421957) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20210973 + 20210974.

It is an arithmetic number, because the mean of its divisors is an integer number (20210974).

Almost surely, 2^40421947 is an apocalyptic number.

40421947 is a deficient number, since it is larger than the sum of its proper divisors (1).

40421947 is an equidigital number, since it uses as much as digits as its factorization.

40421947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 40421947 is about 6357.8256503305. The cubic root of 40421947 is about 343.1935176037.

The spelling of 40421947 in words is "forty million, four hundred twenty-one thousand, nine hundred forty-seven".