7864985839 has 4 divisors (see below), whose sum is σ = 7867341856. Its totient is φ = 7862629824.

The previous prime is 7864985833. The next prime is 7864985881. The reversal of 7864985839 is 9385894687.

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 7864985839 - 2²⁵ = 7831431407 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 (7864985833) 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, 1172994 + ... + 1179679.

It is an arithmetic number, because the mean of its divisors is an integer number (1966835464).

Almost surely, 2^7864985839 is an apocalyptic number.

7864985839 is a deficient number, since it is larger than the sum of its proper divisors (2356017).

7864985839 is a wasteful number, since it uses less digits than its factorization.

7864985839 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2356016.

The product of its digits is 104509440, while the sum is 67.

The square root of 7864985839 is about 88684.7553923446. The cubic root of 7864985839 is about 1988.6849251809.

The spelling of 7864985839 in words is "seven billion, eight hundred sixty-four million, nine hundred eighty-five thousand, eight hundred thirty-nine".