389136420865 has 4 divisors (see below), whose sum is σ = 466963705044. Its totient is φ = 311309136688.

The previous prime is 389136420811. The next prime is 389136420887. The reversal of 389136420865 is 568024631983.

It is a Cunningham number, because it is equal to 623808²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140088512656 + 249047908209 = 374284^2 + 499047^2 .

It is a cyclic number.

It is not a de Polignac number, because 389136420865 - 2⁷ = 389136420737 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38913642082 + ... + 38913642091.

It is an arithmetic number, because the mean of its divisors is an integer number (116740926261).

Almost surely, 2^389136420865 is an apocalyptic number.

It is an amenable number.

389136420865 is a deficient number, since it is larger than the sum of its proper divisors (77827284179).

389136420865 is an equidigital number, since it uses as much as digits as its factorization.

389136420865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77827284178.

The product of its (nonzero) digits is 7464960, while the sum is 55.

The spelling of 389136420865 in words is "three hundred eighty-nine billion, one hundred thirty-six million, four hundred twenty thousand, eight hundred sixty-five".