42457819 has 2 divisors, whose sum is σ = 42457820. Its totient is φ = 42457818.

The previous prime is 42457801. The next prime is 42457843. The reversal of 42457819 is 91875424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42457819 - 2⁹ = 42457307 is a prime.

It is a super-2 number, since 2×42457819² = 3605332788473522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42457319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21228909 + 21228910.

It is an arithmetic number, because the mean of its divisors is an integer number (21228910).

Almost surely, 2^42457819 is an apocalyptic number.

42457819 is a deficient number, since it is larger than the sum of its proper divisors (1).

42457819 is an equidigital number, since it uses as much as digits as its factorization.

42457819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80640, while the sum is 40.

The square root of 42457819 is about 6515.9664670715. The cubic root of 42457819 is about 348.8611117207.

The spelling of 42457819 in words is "forty-two million, four hundred fifty-seven thousand, eight hundred nineteen".