8427378959 has 4 divisors (see below), whose sum is σ = 8870925240. Its totient is φ = 7983832680.

The previous prime is 8427378919. The next prime is 8427378983. The reversal of 8427378959 is 9598737248.

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

It is a de Polignac number, because none of the positive numbers 2^k-8427378959 is a prime.

It is a super-2 number, since 2×8427378959² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8427378919) 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, 221773112 + ... + 221773149.

It is an arithmetic number, because the mean of its divisors is an integer number (2217731310).

Almost surely, 2^8427378959 is an apocalyptic number.

8427378959 is a deficient number, since it is larger than the sum of its proper divisors (443546281).

8427378959 is a wasteful number, since it uses less digits than its factorization.

8427378959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443546280.

The product of its digits is 30481920, while the sum is 62.

The square root of 8427378959 is about 91800.7568541785. The cubic root of 8427378959 is about 2034.9988798799.

The spelling of 8427378959 in words is "eight billion, four hundred twenty-seven million, three hundred seventy-eight thousand, nine hundred fifty-nine".