18971112 has 32 divisors (see below), whose sum is σ = 47541600. Its totient is φ = 6308544.

The previous prime is 18971111. The next prime is 18971119. The reversal of 18971112 is 21117981.

It is a self number, because there is not a number n which added to its sum of digits gives 18971112.

It is not an unprimeable number, because it can be changed into a prime (18971111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14218 + ... + 15494.

It is an arithmetic number, because the mean of its divisors is an integer number (1485675).

Almost surely, 2^18971112 is an apocalyptic number.

18971112 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18971112 is an abundant number, since it is smaller than the sum of its proper divisors (28570488).

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

18971112 is a wasteful number, since it uses less digits than its factorization.

18971112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1905 (or 1901 counting only the distinct ones).

The product of its digits is 1008, while the sum is 30.

The square root of 18971112 is about 4355.5840021747. The cubic root of 18971112 is about 266.7048598073.

The spelling of 18971112 in words is "eighteen million, nine hundred seventy-one thousand, one hundred twelve".