42443539 has 4 divisors (see below), whose sum is σ = 42487360. Its totient is φ = 42399720.

The previous prime is 42443503. The next prime is 42443561. The reversal of 42443539 is 93534424.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 42443539 - 2⁷ = 42443411 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42443039) 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, 20424 + ... + 22405.

It is an arithmetic number, because the mean of its divisors is an integer number (10621840).

Almost surely, 2^42443539 is an apocalyptic number.

42443539 is a deficient number, since it is larger than the sum of its proper divisors (43821).

42443539 is an equidigital number, since it uses as much as digits as its factorization.

42443539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43820.

The product of its digits is 51840, while the sum is 34.

The square root of 42443539 is about 6514.8706050082. The cubic root of 42443539 is about 348.8219960729.

The spelling of 42443539 in words is "forty-two million, four hundred forty-three thousand, five hundred thirty-nine".