42866891 has 2 divisors, whose sum is σ = 42866892. Its totient is φ = 42866890.

The previous prime is 42866839. The next prime is 42866897. The reversal of 42866891 is 19866824.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42866891 - 2⁶ = 42866827 is a prime.

It is not a weakly prime, because it can be changed into another prime (42866897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21433445 + 21433446.

It is an arithmetic number, because the mean of its divisors is an integer number (21433446).

Almost surely, 2^42866891 is an apocalyptic number.

42866891 is a deficient number, since it is larger than the sum of its proper divisors (1).

42866891 is an equidigital number, since it uses as much as digits as its factorization.

42866891 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The square root of 42866891 is about 6547.2811914565. The cubic root of 42866891 is about 349.9779333027.

The spelling of 42866891 in words is "forty-two million, eight hundred sixty-six thousand, eight hundred ninety-one".