389999986 has 8 divisors (see below), whose sum is σ = 590792364. Its totient is φ = 193069200.

The previous prime is 389999977. The next prime is 389999989. The reversal of 389999986 is 689999983.

It can be written as a sum of positive squares in 2 ways, for example, as 371294361 + 18705625 = 19269^2 + 4325^2 .

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

It is not an unprimeable number, because it can be changed into a prime (389999989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 965145 + ... + 965548.

Almost surely, 2^389999986 is an apocalyptic number.

389999986 is a deficient number, since it is larger than the sum of its proper divisors (200792378).

389999986 is a wasteful number, since it uses less digits than its factorization.

389999986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1930796.

The product of its digits is 68024448, while the sum is 70.

The square root of 389999986 is about 19748.4173036727. The cubic root of 389999986 is about 730.6143486639.

The spelling of 389999986 in words is "three hundred eighty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-six".