817986389476 has 9 divisors (see below), whose sum is σ = 1431479347081. Its totient is φ = 408992290312.

The previous prime is 817986389471. The next prime is 817986389489. The reversal of 817986389476 is 674983689718.

The square root of 817986389476 is 904426.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 90440100 + 817895949376 = 9510^2 + 904376^2 .

It is a super-3 number, since 3×817986389476³ (a number of 37 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (817986389471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1582746 + ... + 2034958.

Almost surely, 2^817986389476 is an apocalyptic number.

817986389476 is the 904426-th square number.

It is an amenable number.

817986389476 is a deficient number, since it is larger than the sum of its proper divisors (613492957605).

817986389476 is an frugal number, since it uses more digits than its factorization.

817986389476 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 904430 (or 452215 counting only the distinct ones).

The product of its digits is 877879296, while the sum is 76.

The spelling of 817986389476 in words is "eight hundred seventeen billion, nine hundred eighty-six million, three hundred eighty-nine thousand, four hundred seventy-six".