18122988 has 48 divisors (see below), whose sum is σ = 47529216. Its totient is φ = 5332800.

The previous prime is 18122947. The next prime is 18122989. The reversal of 18122988 is 88922181.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (18122989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1063 + ... + 6113.

It is an arithmetic number, because the mean of its divisors is an integer number (990192).

Almost surely, 2^18122988 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 18122988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23764608).

18122988 is an abundant number, since it is smaller than the sum of its proper divisors (29406228).

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

18122988 is a wasteful number, since it uses less digits than its factorization.

18122988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5094 (or 5092 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The square root of 18122988 is about 4257.1102875072. The cubic root of 18122988 is about 262.6696735235.

It can be divided in two parts, 18122 and 988, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 18122988 in words is "eighteen million, one hundred twenty-two thousand, nine hundred eighty-eight".