8391893855 has 12 divisors (see below), whose sum is σ = 10697488680. Its totient is φ = 6318601344.

The previous prime is 8391893833. The next prime is 8391893869. The reversal of 8391893855 is 5583981938.

It is not a de Polignac number, because 8391893855 - 2¹⁸ = 8391631711 is a prime.

It is a super-2 number, since 2×8391893855² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 8391893794 and 8391893803.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2902325 + ... + 2905214.

It is an arithmetic number, because the mean of its divisors is an integer number (891457390).

Almost surely, 2^8391893855 is an apocalyptic number.

8391893855 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

8391893855 is a deficient number, since it is larger than the sum of its proper divisors (2305594825).

8391893855 is a wasteful number, since it uses less digits than its factorization.

8391893855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5807578 (or 5807561 counting only the distinct ones).

The product of its digits is 9331200, while the sum is 59.

The square root of 8391893855 is about 91607.2805785654. The cubic root of 8391893855 is about 2032.1386098246.

The spelling of 8391893855 in words is "eight billion, three hundred ninety-one million, eight hundred ninety-three thousand, eight hundred fifty-five".