40491457 has 2 divisors, whose sum is σ = 40491458. Its totient is φ = 40491456.

The previous prime is 40491443. The next prime is 40491469. The reversal of 40491457 is 75419404.

40491457 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 35034561 + 5456896 = 5919^2 + 2336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40491457 is a prime.

It is not a weakly prime, because it can be changed into another prime (40491497) 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, 20245728 + 20245729.

It is an arithmetic number, because the mean of its divisors is an integer number (20245729).

Almost surely, 2^40491457 is an apocalyptic number.

It is an amenable number.

40491457 is a deficient number, since it is larger than the sum of its proper divisors (1).

40491457 is an equidigital number, since it uses as much as digits as its factorization.

40491457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 40491457 is about 6363.2897938095. The cubic root of 40491457 is about 343.3901246636.

The spelling of 40491457 in words is "forty million, four hundred ninety-one thousand, four hundred fifty-seven".