42447539 has 4 divisors (see below), whose sum is σ = 44681640. Its totient is φ = 40213440.

The previous prime is 42447511. The next prime is 42447551. The reversal of 42447539 is 93574424.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42447539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42447599) 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, 1117022 + ... + 1117059.

It is an arithmetic number, because the mean of its divisors is an integer number (11170410).

Almost surely, 2^42447539 is an apocalyptic number.

42447539 is a deficient number, since it is larger than the sum of its proper divisors (2234101).

42447539 is a wasteful number, since it uses less digits than its factorization.

42447539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234100.

The product of its digits is 120960, while the sum is 38.

The square root of 42447539 is about 6515.1775877561. The cubic root of 42447539 is about 348.8329537215.

The spelling of 42447539 in words is "forty-two million, four hundred forty-seven thousand, five hundred thirty-nine".