42784559 has 4 divisors (see below), whose sum is σ = 42821616. Its totient is φ = 42747504.

The previous prime is 42784517. The next prime is 42784579. The reversal of 42784559 is 95548724.

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 42784559 - 2²⁴ = 26007343 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 (42784579) 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, 16739 + ... + 19124.

It is an arithmetic number, because the mean of its divisors is an integer number (10705404).

Almost surely, 2^42784559 is an apocalyptic number.

42784559 is a deficient number, since it is larger than the sum of its proper divisors (37057).

42784559 is a wasteful number, since it uses less digits than its factorization.

42784559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37056.

The product of its digits is 403200, while the sum is 44.

The square root of 42784559 is about 6540.9906742022. The cubic root of 42784559 is about 349.7537287972.

The spelling of 42784559 in words is "forty-two million, seven hundred eighty-four thousand, five hundred fifty-nine".