389139666 has 8 divisors (see below), whose sum is σ = 778279344. Its totient is φ = 129713220.

The previous prime is 389139643. The next prime is 389139731. The reversal of 389139666 is 666931983.

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

389139666 is an admirable 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, 32428300 + ... + 32428311.

It is an arithmetic number, because the mean of its divisors is an integer number (97284918).

Almost surely, 2^389139666 is an apocalyptic number.

389139666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

389139666 is a wasteful number, since it uses less digits than its factorization.

389139666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64856616.

The product of its digits is 1259712, while the sum is 51.

The square root of 389139666 is about 19726.6232792133. The cubic root of 389139666 is about 730.0767205286.

The spelling of 389139666 in words is "three hundred eighty-nine million, one hundred thirty-nine thousand, six hundred sixty-six".