853421939 has 4 divisors (see below), whose sum is σ = 853687224. Its totient is φ = 853156656.

The previous prime is 853421893. The next prime is 853421941. The reversal of 853421939 is 939124358.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-853421939 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 853421939.

It is not an unprimeable number, because it can be changed into a prime (853421039) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127757 + ... + 134270.

It is an arithmetic number, because the mean of its divisors is an integer number (213421806).

Almost surely, 2^853421939 is an apocalyptic number.

853421939 is a deficient number, since it is larger than the sum of its proper divisors (265285).

853421939 is a wasteful number, since it uses less digits than its factorization.

853421939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265284.

The product of its digits is 233280, while the sum is 44.

The square root of 853421939 is about 29213.3862980655. The cubic root of 853421939 is about 948.5377093218.

The spelling of 853421939 in words is "eight hundred fifty-three million, four hundred twenty-one thousand, nine hundred thirty-nine".