40421957 has 2 divisors, whose sum is σ = 40421958. Its totient is φ = 40421956.

The previous prime is 40421947. The next prime is 40421999. The reversal of 40421957 is 75912404.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32615521 + 7806436 = 5711^2 + 2794^2 .

It is a cyclic number.

It is not a de Polignac number, because 40421957 - 2⁶ = 40421893 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40421947) 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, 20210978 + 20210979.

It is an arithmetic number, because the mean of its divisors is an integer number (20210979).

Almost surely, 2^40421957 is an apocalyptic number.

It is an amenable number.

40421957 is a deficient number, since it is larger than the sum of its proper divisors (1).

40421957 is an equidigital number, since it uses as much as digits as its factorization.

40421957 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 40421957 is about 6357.8264367628. The cubic root of 40421957 is about 343.1935459046.

The spelling of 40421957 in words is "forty million, four hundred twenty-one thousand, nine hundred fifty-seven".