389666386 has 16 divisors (see below), whose sum is σ = 592752600. Its totient is φ = 192094848.

The previous prime is 389666377. The next prime is 389666399. The reversal of 389666386 is 683666983.

It can be written as a sum of positive squares in 4 ways, for example, as 200081025 + 189585361 = 14145^2 + 13769^2 .

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, 63460 + ... + 69328.

Almost surely, 2^389666386 is an apocalyptic number.

389666386 is a deficient number, since it is larger than the sum of its proper divisors (203086214).

389666386 is a wasteful number, since it uses less digits than its factorization.

389666386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6333.

The product of its digits is 6718464, while the sum is 55.

The square root of 389666386 is about 19739.9692502293. The cubic root of 389666386 is about 730.4059704727.

The spelling of 389666386 in words is "three hundred eighty-nine million, six hundred sixty-six thousand, three hundred eighty-six".