42856019 has 2 divisors, whose sum is σ = 42856020. Its totient is φ = 42856018.

The previous prime is 42856013. The next prime is 42856067. The reversal of 42856019 is 91065824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42856019 - 2⁴ = 42856003 is a prime.

It is a super-2 number, since 2×42856019² = 3673276729056722, which contains 22 as substring.

It is equal to p_2596436 and since 42856019 and 2596436 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42856019.

It is not a weakly prime, because it can be changed into another prime (42856013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21428009 + 21428010.

It is an arithmetic number, because the mean of its divisors is an integer number (21428010).

Almost surely, 2^42856019 is an apocalyptic number.

42856019 is a deficient number, since it is larger than the sum of its proper divisors (1).

42856019 is an equidigital number, since it uses as much as digits as its factorization.

42856019 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 42856019 is about 6546.4508705099. The cubic root of 42856019 is about 349.9483433968.

The spelling of 42856019 in words is "forty-two million, eight hundred fifty-six thousand, nineteen".