42517439 has 4 divisors (see below), whose sum is σ = 42565224. Its totient is φ = 42469656.

The previous prime is 42517429. The next prime is 42517471. The reversal of 42517439 is 93471524.

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-42517439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42517399 and 42517408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42517429) 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, 22532 + ... + 24345.

It is an arithmetic number, because the mean of its divisors is an integer number (10641306).

Almost surely, 2^42517439 is an apocalyptic number.

42517439 is a deficient number, since it is larger than the sum of its proper divisors (47785).

42517439 is an equidigital number, since it uses as much as digits as its factorization.

42517439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47784.

The product of its digits is 30240, while the sum is 35.

The square root of 42517439 is about 6520.5397782699. The cubic root of 42517439 is about 349.0243276063.

The spelling of 42517439 in words is "forty-two million, five hundred seventeen thousand, four hundred thirty-nine".