389138888 has 8 divisors (see below), whose sum is σ = 729635430. Its totient is φ = 194569440.

The previous prime is 389138861. The next prime is 389138899. The reversal of 389138888 is 888831983.

It can be written as a sum of positive squares in only one way, i.e., 377835844 + 11303044 = 19438^2 + 3362^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24321173 + ... + 24321188.

Almost surely, 2^389138888 is an apocalyptic number.

It is an amenable number.

389138888 is a deficient number, since it is larger than the sum of its proper divisors (340496542).

389138888 is a wasteful number, since it uses less digits than its factorization.

389138888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48642367 (or 48642363 counting only the distinct ones).

The product of its digits is 2654208, while the sum is 56.

The square root of 389138888 is about 19726.6035596602. The cubic root of 389138888 is about 730.0762339852.

The spelling of 389138888 in words is "three hundred eighty-nine million, one hundred thirty-eight thousand, eight hundred eighty-eight".