18827172 has 108 divisors (see below), whose sum is σ = 59691996. Its totient is φ = 4959360.

The previous prime is 18827167. The next prime is 18827197. The reversal of 18827172 is 27172881.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3896676 + 14930496 = 1974^2 + 3864^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 35 ways as a sum of consecutive naturals, for example, 22522 + ... + 23342.

Almost surely, 2^18827172 is an apocalyptic number.

18827172 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18827172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29845998).

18827172 is an abundant number, since it is smaller than the sum of its proper divisors (40864824).

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

18827172 is a wasteful number, since it uses less digits than its factorization.

18827172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 858 (or 846 counting only the distinct ones).

The product of its digits is 12544, while the sum is 36.

The square root of 18827172 is about 4339.0289236187. The cubic root of 18827172 is about 266.0286211124.

The spelling of 18827172 in words is "eighteen million, eight hundred twenty-seven thousand, one hundred seventy-two".