42985879 has 2 divisors, whose sum is σ = 42985880. Its totient is φ = 42985878.

The previous prime is 42985867. The next prime is 42985951. The reversal of 42985879 is 97858924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42985879 - 2¹⁵ = 42953111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42985849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21492939 + 21492940.

It is an arithmetic number, because the mean of its divisors is an integer number (21492940).

Almost surely, 2^42985879 is an apocalyptic number.

42985879 is a deficient number, since it is larger than the sum of its proper divisors (1).

42985879 is an equidigital number, since it uses as much as digits as its factorization.

42985879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

The square root of 42985879 is about 6556.3617197345. The cubic root of 42985879 is about 350.3014518523.

The spelling of 42985879 in words is "forty-two million, nine hundred eighty-five thousand, eight hundred seventy-nine".