42889009 has 4 divisors (see below), whose sum is σ = 43073316. Its totient is φ = 42704704.

The previous prime is 42889003. The next prime is 42889013. The reversal of 42889009 is 90098824.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9941409 + 32947600 = 3153^2 + 5740^2 .

It is a cyclic number.

It is not a de Polignac number, because 42889009 - 2¹⁷ = 42757937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42889003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91804 + ... + 92269.

It is an arithmetic number, because the mean of its divisors is an integer number (10768329).

Almost surely, 2^42889009 is an apocalyptic number.

It is an amenable number.

42889009 is a deficient number, since it is larger than the sum of its proper divisors (184307).

42889009 is a wasteful number, since it uses less digits than its factorization.

42889009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 184306.

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 42889009 is about 6548.9700716983. The cubic root of 42889009 is about 350.0381155769.

The spelling of 42889009 in words is "forty-two million, eight hundred eighty-nine thousand, nine".