869787819 has 6 divisors (see below), whose sum is σ = 1256360196. Its totient is φ = 579858540.

The previous prime is 869787797. The next prime is 869787829. The reversal of 869787819 is 918787968.

It is not a de Polignac number, because 869787819 - 2¹⁹ = 869263531 is a prime.

It is a super-2 number, since 2×869787819² = 1513061700161553522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (869787829) 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 5 ways as a sum of consecutive naturals, for example, 48321537 + ... + 48321554.

It is an arithmetic number, because the mean of its divisors is an integer number (209393366).

Almost surely, 2^869787819 is an apocalyptic number.

869787819 is a deficient number, since it is larger than the sum of its proper divisors (386572377).

869787819 is a wasteful number, since it uses less digits than its factorization.

869787819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96643097 (or 96643094 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The square root of 869787819 is about 29492.1653833692. The cubic root of 869787819 is about 954.5626567611.

The spelling of 869787819 in words is "eight hundred sixty-nine million, seven hundred eighty-seven thousand, eight hundred nineteen".