42798857 has 2 divisors, whose sum is σ = 42798858. Its totient is φ = 42798856.

The previous prime is 42798827. The next prime is 42798859. The reversal of 42798857 is 75889724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37650496 + 5148361 = 6136^2 + 2269^2 .

It is a cyclic number.

It is not a de Polignac number, because 42798857 - 2¹⁶ = 42733321 is a prime.

Together with 42798859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42798859) 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, 21399428 + 21399429.

It is an arithmetic number, because the mean of its divisors is an integer number (21399429).

Almost surely, 2^42798857 is an apocalyptic number.

It is an amenable number.

42798857 is a deficient number, since it is larger than the sum of its proper divisors (1).

42798857 is an equidigital number, since it uses as much as digits as its factorization.

42798857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1128960, while the sum is 50.

The square root of 42798857 is about 6542.0835366113. The cubic root of 42798857 is about 349.7926853894.

The spelling of 42798857 in words is "forty-two million, seven hundred ninety-eight thousand, eight hundred fifty-seven".