389765881 has 8 divisors (see below), whose sum is σ = 402956864. Its totient is φ = 376714800.

The previous prime is 389765861. The next prime is 389765897. The reversal of 389765881 is 188567983.

389765881 = 149² + 150² + ... + 1054².

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 389765881 - 2¹¹ = 389763833 is a prime.

It is a super-2 number, since 2×389765881² = 303834883983412322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389765801) 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 7 ways as a sum of consecutive naturals, for example, 29295 + ... + 40468.

It is an arithmetic number, because the mean of its divisors is an integer number (50369608).

Almost surely, 2^389765881 is an apocalyptic number.

It is an amenable number.

389765881 is a deficient number, since it is larger than the sum of its proper divisors (13190983).

389765881 is a wasteful number, since it uses less digits than its factorization.

389765881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69951.

The product of its digits is 2903040, while the sum is 55.

The square root of 389765881 is about 19742.4892300844. The cubic root of 389765881 is about 730.4681309604.

The spelling of 389765881 in words is "three hundred eighty-nine million, seven hundred sixty-five thousand, eight hundred eighty-one".