18861472 has 72 divisors (see below), whose sum is σ = 45160416. Its totient is φ = 7717248.

The previous prime is 18861461. The next prime is 18861499. The reversal of 18861472 is 27416881.

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 11 ways as a sum of consecutive naturals, for example, 35803 + ... + 36325.

It is an arithmetic number, because the mean of its divisors is an integer number (627228).

Almost surely, 2^18861472 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18861472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22580208).

18861472 is an abundant number, since it is smaller than the sum of its proper divisors (26298944).

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

18861472 is a wasteful number, since it uses less digits than its factorization.

18861472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570 (or 555 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 18861472 is about 4342.9796223330. The cubic root of 18861472 is about 266.1900765171.

The spelling of 18861472 in words is "eighteen million, eight hundred sixty-one thousand, four hundred seventy-two".