42009989 has 4 divisors (see below), whose sum is σ = 48011424. Its totient is φ = 36008556.

The previous prime is 42009971. The next prime is 42010013. The reversal of 42009989 is 98990024.

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 not a de Polignac number, because 42009989 - 2¹² = 42005893 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 (42009959) 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, 3000707 + ... + 3000720.

It is an arithmetic number, because the mean of its divisors is an integer number (12002856).

Almost surely, 2^42009989 is an apocalyptic number.

It is an amenable number.

42009989 is a deficient number, since it is larger than the sum of its proper divisors (6001435).

42009989 is an equidigital number, since it uses as much as digits as its factorization.

42009989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6001434.

The product of its (nonzero) digits is 46656, while the sum is 41.

The square root of 42009989 is about 6481.5113206721. The cubic root of 42009989 is about 347.6302194711.

The spelling of 42009989 in words is "forty-two million, nine thousand, nine hundred eighty-nine".