389644855 has 4 divisors (see below), whose sum is σ = 467573832. Its totient is φ = 311715880.

The previous prime is 389644847. The next prime is 389644861. The reversal of 389644855 is 558446983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 558446983 = 929 ⋅601127.

It is not a de Polignac number, because 389644855 - 2³ = 389644847 is a prime.

It is a super-2 number, since 2×389644855² = 303646226055942050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent 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, 38964481 + ... + 38964490.

It is an arithmetic number, because the mean of its divisors is an integer number (116893458).

Almost surely, 2^389644855 is an apocalyptic number.

389644855 is a deficient number, since it is larger than the sum of its proper divisors (77928977).

389644855 is an equidigital number, since it uses as much as digits as its factorization.

389644855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77928976.

The product of its digits is 4147200, while the sum is 52.

The square root of 389644855 is about 19739.4238771044. The cubic root of 389644855 is about 730.3925173744.

The spelling of 389644855 in words is "three hundred eighty-nine million, six hundred forty-four thousand, eight hundred fifty-five".