42789847 has 4 divisors (see below), whose sum is σ = 42850080. Its totient is φ = 42729616.

The previous prime is 42789829. The next prime is 42789863. The reversal of 42789847 is 74898724.

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 42789847 - 2²³ = 34401239 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 42789847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42789247) 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, 29038 + ... + 30475.

It is an arithmetic number, because the mean of its divisors is an integer number (10712520).

Almost surely, 2^42789847 is an apocalyptic number.

42789847 is a deficient number, since it is larger than the sum of its proper divisors (60233).

42789847 is an equidigital number, since it uses as much as digits as its factorization.

42789847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60232.

The product of its digits is 903168, while the sum is 49.

The square root of 42789847 is about 6541.3948818276. The cubic root of 42789847 is about 349.7681375899.

The spelling of 42789847 in words is "forty-two million, seven hundred eighty-nine thousand, eight hundred forty-seven".