18438552 has 96 divisors (see below), whose sum is σ = 56309760. Its totient is φ = 5400000.

The previous prime is 18438547. The next prime is 18438587. The reversal of 18438552 is 25583481.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 24177 + ... + 24927.

It is an arithmetic number, because the mean of its divisors is an integer number (586560).

Almost surely, 2^18438552 is an apocalyptic number.

18438552 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 18438552, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28154880).

18438552 is an abundant number, since it is smaller than the sum of its proper divisors (37871208).

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

18438552 is a wasteful number, since it uses less digits than its factorization.

18438552 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 805 (or 798 counting only the distinct ones).

The product of its digits is 38400, while the sum is 36.

The square root of 18438552 is about 4294.0135071981. The cubic root of 18438552 is about 264.1854757223.

Subtracting 18438552 from its reverse (25583481), we obtain a square (7144929 = 2673²).

The spelling of 18438552 in words is "eighteen million, four hundred thirty-eight thousand, five hundred fifty-two".