1138889172 has 12 divisors (see below), whose sum is σ = 2657408096. Its totient is φ = 379629720.

The previous prime is 1138889159. The next prime is 1138889173. The reversal of 1138889172 is 2719888311.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1138889173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47453704 + ... + 47453727.

Almost surely, 2^1138889172 is an apocalyptic number.

1138889172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1138889172 is an abundant number, since it is smaller than the sum of its proper divisors (1518518924).

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

1138889172 is a wasteful number, since it uses less digits than its factorization.

1138889172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94907438 (or 94907436 counting only the distinct ones).

The product of its digits is 193536, while the sum is 48.

The square root of 1138889172 is about 33747.4320800857. The cubic root of 1138889172 is about 1044.3045125426.

The spelling of 1138889172 in words is "one billion, one hundred thirty-eight million, eight hundred eighty-nine thousand, one hundred seventy-two".