18051572 has 96 divisors (see below), whose sum is σ = 42577920. Its totient is φ = 6491520.

The previous prime is 18051571. The next prime is 18051589. The reversal of 18051572 is 27515081.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18051571) 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 31 ways as a sum of consecutive naturals, for example, 384053 + ... + 384099.

It is an arithmetic number, because the mean of its divisors is an integer number (443520).

Almost surely, 2^18051572 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 18051572, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21288960).

18051572 is an abundant number, since it is smaller than the sum of its proper divisors (24526348).

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

18051572 is a wasteful number, since it uses less digits than its factorization.

18051572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 29.

The square root of 18051572 is about 4248.7141584249. The cubic root of 18051572 is about 262.3241912735.

The spelling of 18051572 in words is "eighteen million, fifty-one thousand, five hundred seventy-two".