1389012678 has 32 divisors (see below), whose sum is σ = 3161985120. Its totient is φ = 451710720.

The previous prime is 1389012673. The next prime is 1389012679. The reversal of 1389012678 is 8762109831.

1389012678 is a `hidden beast` number, since 1 + 389 + 0 + 1 + 267 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389012673) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 311475 + ... + 315902.

It is an arithmetic number, because the mean of its divisors is an integer number (98812035).

Almost surely, 2^1389012678 is an apocalyptic number.

1389012678 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1389012678 is an abundant number, since it is smaller than the sum of its proper divisors (1772972442).

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

1389012678 is a wasteful number, since it uses less digits than its factorization.

1389012678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627429 (or 627423 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 1389012678 is about 37269.4603931959. The cubic root of 1389012678 is about 1115.7547298895.

The spelling of 1389012678 in words is "one billion, three hundred eighty-nine million, twelve thousand, six hundred seventy-eight".