389991216 has 40 divisors (see below), whose sum is σ = 1017875824. Its totient is φ = 128655360.

The previous prime is 389991193. The next prime is 389991227. The reversal of 389991216 is 612199983.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37225 + ... + 46536.

Almost surely, 2^389991216 is an apocalyptic number.

It is an amenable number.

389991216 is an abundant number, since it is smaller than the sum of its proper divisors (627884608).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

389991216 is a wasteful number, since it uses less digits than its factorization.

389991216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83869 (or 83863 counting only the distinct ones).

The product of its digits is 209952, while the sum is 48.

The square root of 389991216 is about 19748.1952593142. The cubic root of 389991216 is about 730.6088721373.

The spelling of 389991216 in words is "three hundred eighty-nine million, nine hundred ninety-one thousand, two hundred sixteen".