42805999 has 2 divisors, whose sum is σ = 42806000. Its totient is φ = 42805998.

The previous prime is 42805991. The next prime is 42806041. The reversal of 42805999 is 99950824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42805999 - 2³ = 42805991 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42805991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21402999 + 21403000.

It is an arithmetic number, because the mean of its divisors is an integer number (21403000).

Almost surely, 2^42805999 is an apocalyptic number.

42805999 is a deficient number, since it is larger than the sum of its proper divisors (1).

42805999 is an equidigital number, since it uses as much as digits as its factorization.

42805999 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 46.

The square root of 42805999 is about 6542.6293644069. The cubic root of 42805999 is about 349.8121413639.

The spelling of 42805999 in words is "forty-two million, eight hundred five thousand, nine hundred ninety-nine".