42866839 has 2 divisors, whose sum is σ = 42866840. Its totient is φ = 42866838.

The previous prime is 42866827. The next prime is 42866891. The reversal of 42866839 is 93866824.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42866839 - 2⁵ = 42866807 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42866819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21433419 + 21433420.

It is an arithmetic number, because the mean of its divisors is an integer number (21433420).

Almost surely, 2^42866839 is an apocalyptic number.

42866839 is a deficient number, since it is larger than the sum of its proper divisors (1).

42866839 is an equidigital number, since it uses as much as digits as its factorization.

42866839 is an evil number, because the sum of its binary digits is even.

The product of its digits is 497664, while the sum is 46.

The square root of 42866839 is about 6547.2772203413. The cubic root of 42866839 is about 349.9777917882.

The spelling of 42866839 in words is "forty-two million, eight hundred sixty-six thousand, eight hundred thirty-nine".