1389021166 has 32 divisors (see below), whose sum is σ = 2262693888. Its totient is φ = 635718240.

The previous prime is 1389021143. The next prime is 1389021173. The reversal of 1389021166 is 6611209831.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2288035 + ... + 2288641.

It is an arithmetic number, because the mean of its divisors is an integer number (70709184).

Almost surely, 2^1389021166 is an apocalyptic number.

1389021166 is a deficient number, since it is larger than the sum of its proper divisors (873672722).

1389021166 is a wasteful number, since it uses less digits than its factorization.

1389021166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1216.

The product of its (nonzero) digits is 15552, while the sum is 37.

The square root of 1389021166 is about 37269.5742664174. The cubic root of 1389021166 is about 1115.7570026086.

The spelling of 1389021166 in words is "one billion, three hundred eighty-nine million, twenty-one thousand, one hundred sixty-six".