389643881 has 8 divisors (see below), whose sum is σ = 426254400. Its totient is φ = 353231440.

The previous prime is 389643857. The next prime is 389643907. The reversal of 389643881 is 188346983.

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

It is a cyclic number.

It is not a de Polignac number, because 389643881 - 2¹⁰ = 389642857 is a prime.

It is a super-2 number, since 2×389643881² = 303644708001484322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (389643581) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45386 + ... + 53283.

It is an arithmetic number, because the mean of its divisors is an integer number (53281800).

Almost surely, 2^389643881 is an apocalyptic number.

It is an amenable number.

389643881 is a deficient number, since it is larger than the sum of its proper divisors (36610519).

389643881 is a wasteful number, since it uses less digits than its factorization.

389643881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99039.

The product of its digits is 995328, while the sum is 50.

The square root of 389643881 is about 19739.3992056496. The cubic root of 389643881 is about 730.3919087835.

The spelling of 389643881 in words is "three hundred eighty-nine million, six hundred forty-three thousand, eight hundred eighty-one".