42806287 has 2 divisors, whose sum is σ = 42806288. Its totient is φ = 42806286.

The previous prime is 42806279. The next prime is 42806303. The reversal of 42806287 is 78260824.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42806287 - 2³ = 42806279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42806087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21403143 + 21403144.

It is an arithmetic number, because the mean of its divisors is an integer number (21403144).

Almost surely, 2^42806287 is an apocalyptic number.

42806287 is a deficient number, since it is larger than the sum of its proper divisors (1).

42806287 is an equidigital number, since it uses as much as digits as its factorization.

42806287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43008, while the sum is 37.

The square root of 42806287 is about 6542.6513738698. The cubic root of 42806287 is about 349.8129258775.

The spelling of 42806287 in words is "forty-two million, eight hundred six thousand, two hundred eighty-seven".