386615990477809 has 3 divisors (see below), whose sum is σ = 386616010140363. Its totient is φ = 386615970815256.

The previous prime is 386615990477741. The next prime is 386615990477881. The reversal of 386615990477809 is 908774099516683.

The square root of 386615990477809 is 19662553.

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

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 205512437847025 + 181103552630784 = 14335705^2 + 13457472^2 .

It is not a de Polignac number, because 386615990477809 - 2¹⁹ = 386615989953521 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (386615990477309) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9831277 + ... + 29493829.

It is an arithmetic number, because the mean of its divisors is an integer number (128872003380121).

Almost surely, 2^{386615990477809} is an apocalyptic number.

386615990477809 is the 19662553-rd square number.

386615990477809 is the 9831277-th centered octagonal number.

It is an amenable number.

386615990477809 is a deficient number, since it is larger than the sum of its proper divisors (19662554).

386615990477809 is an frugal number, since it uses more digits than its factorization.

386615990477809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39325106 (or 19662553 counting only the distinct ones).

The product of its (nonzero) digits is 4938071040, while the sum is 82.

The spelling of 386615990477809 in words is "three hundred eighty-six trillion, six hundred fifteen billion, nine hundred ninety million, four hundred seventy-seven thousand, eight hundred nine".