842457019 has 2 divisors, whose sum is σ = 842457020. Its totient is φ = 842457018.

The previous prime is 842457013. The next prime is 842457029. The reversal of 842457019 is 910754248.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 842457019 - 2⁵ = 842456987 is a prime.

It is a super-2 number, since 2×842457019² = 1419467657724732722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (842457013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 421228509 + 421228510.

It is an arithmetic number, because the mean of its divisors is an integer number (421228510).

Almost surely, 2^842457019 is an apocalyptic number.

842457019 is a deficient number, since it is larger than the sum of its proper divisors (1).

842457019 is an equidigital number, since it uses as much as digits as its factorization.

842457019 is an evil number, because the sum of its binary digits is even.

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

The square root of 842457019 is about 29025.1101462165. The cubic root of 842457019 is about 944.4578579928.

The spelling of 842457019 in words is "eight hundred forty-two million, four hundred fifty-seven thousand, nineteen".