42842819 has 2 divisors, whose sum is σ = 42842820. Its totient is φ = 42842818.

The previous prime is 42842797. The next prime is 42842869. The reversal of 42842819 is 91824824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42842819 - 2⁸ = 42842563 is a prime.

It is a super-2 number, since 2×42842819² = 3671014279733522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (42842869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21421409 + 21421410.

It is an arithmetic number, because the mean of its divisors is an integer number (21421410).

Almost surely, 2^42842819 is an apocalyptic number.

42842819 is a deficient number, since it is larger than the sum of its proper divisors (1).

42842819 is an equidigital number, since it uses as much as digits as its factorization.

42842819 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36864, while the sum is 38.

The square root of 42842819 is about 6545.4426129942. The cubic root of 42842819 is about 349.9124107352.

The spelling of 42842819 in words is "forty-two million, eight hundred forty-two thousand, eight hundred nineteen".