42089989 has 4 divisors (see below), whose sum is σ = 42135660. Its totient is φ = 42044320.

The previous prime is 42089963. The next prime is 42090017. The reversal of 42089989 is 98998024.

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 29430625 + 12659364 = 5425^2 + 3558^2 .

It is a cyclic number.

It is not a de Polignac number, because 42089989 - 2¹⁹ = 41565701 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 (42089189) 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, 21424 + ... + 23305.

It is an arithmetic number, because the mean of its divisors is an integer number (10533915).

Almost surely, 2^42089989 is an apocalyptic number.

It is an amenable number.

42089989 is a deficient number, since it is larger than the sum of its proper divisors (45671).

42089989 is an equidigital number, since it uses as much as digits as its factorization.

42089989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45670.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 42089989 is about 6487.6797855628. The cubic root of 42089989 is about 347.8507446657.

It can be divided in two parts, 420 and 89989, that added together give a palindrome (90409).

The spelling of 42089989 in words is "forty-two million, eighty-nine thousand, nine hundred eighty-nine".