865386219840 has 56 divisors (see below), whose sum is σ = 2747601251040. Its totient is φ = 230769658368.

The previous prime is 865386219839. The next prime is 865386219881. The reversal of 865386219840 is 48912683568.

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 450721030 + ... + 450722949.

Almost surely, 2^865386219840 is an apocalyptic number.

865386219840 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

865386219840 is an abundant number, since it is smaller than the sum of its proper divisors (1882215031200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

865386219840 is a wasteful number, since it uses less digits than its factorization.

865386219840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901443999 (or 901443989 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 60.

The spelling of 865386219840 in words is "eight hundred sixty-five billion, three hundred eighty-six million, two hundred nineteen thousand, eight hundred forty".