855217839 has 8 divisors (see below), whose sum is σ = 1303189120. Its totient is φ = 488695896.

The previous prime is 855217837. The next prime is 855217843. The reversal of 855217839 is 938712558.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 855217839 - 2¹ = 855217837 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 (855217837) 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 7 ways as a sum of consecutive naturals, for example, 20362309 + ... + 20362350.

It is an arithmetic number, because the mean of its divisors is an integer number (162898640).

Almost surely, 2^855217839 is an apocalyptic number.

855217839 is a deficient number, since it is larger than the sum of its proper divisors (447971281).

855217839 is a wasteful number, since it uses less digits than its factorization.

855217839 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40724669.

The product of its digits is 604800, while the sum is 48.

The square root of 855217839 is about 29244.1077654970. The cubic root of 855217839 is about 949.2025955026.

The spelling of 855217839 in words is "eight hundred fifty-five million, two hundred seventeen thousand, eight hundred thirty-nine".