42168989 has 4 divisors (see below), whose sum is σ = 42202656. Its totient is φ = 42135324.

The previous prime is 42168977. The next prime is 42169007. The reversal of 42168989 is 98986124.

42168989 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42168989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42168089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14879 + ... + 17484.

It is an arithmetic number, because the mean of its divisors is an integer number (10550664).

Almost surely, 2^42168989 is an apocalyptic number.

It is an amenable number.

42168989 is a deficient number, since it is larger than the sum of its proper divisors (33667).

42168989 is a wasteful number, since it uses less digits than its factorization.

42168989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33666.

The product of its digits is 248832, while the sum is 47.

The square root of 42168989 is about 6493.7653945920. The cubic root of 42168989 is about 348.0682392495.

The spelling of 42168989 in words is "forty-two million, one hundred sixty-eight thousand, nine hundred eighty-nine".