42784917 has 8 divisors (see below), whose sum is σ = 65196096. Its totient is φ = 24448512.

The previous prime is 42784897. The next prime is 42784921. The reversal of 42784917 is 71948724.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42784917 - 2¹¹ = 42782869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42784997) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1018668 + ... + 1018709.

It is an arithmetic number, because the mean of its divisors is an integer number (8149512).

Almost surely, 2^42784917 is an apocalyptic number.

It is an amenable number.

42784917 is a deficient number, since it is larger than the sum of its proper divisors (22411179).

42784917 is a wasteful number, since it uses less digits than its factorization.

42784917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2037387.

The product of its digits is 112896, while the sum is 42.

The square root of 42784917 is about 6541.0180400302. The cubic root of 42784917 is about 349.7547043164.

The spelling of 42784917 in words is "forty-two million, seven hundred eighty-four thousand, nine hundred seventeen".