642853447 has 4 divisors (see below), whose sum is σ = 642950496. Its totient is φ = 642756400.

The previous prime is 642853433. The next prime is 642853481. The reversal of 642853447 is 744358246.

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 642853447 - 2¹⁹ = 642329159 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 (642853247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37798 + ... + 52099.

It is an arithmetic number, because the mean of its divisors is an integer number (160737624).

Almost surely, 2^642853447 is an apocalyptic number.

642853447 is a deficient number, since it is larger than the sum of its proper divisors (97049).

642853447 is an equidigital number, since it uses as much as digits as its factorization.

642853447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97048.

The product of its digits is 645120, while the sum is 43.

The square root of 642853447 is about 25354.5547584650. The cubic root of 642853447 is about 863.0527200622.

The spelling of 642853447 in words is "six hundred forty-two million, eight hundred fifty-three thousand, four hundred forty-seven".