18122940 has 168 divisors, whose sum is σ = 62799408. Its totient is φ = 4354560.

The previous prime is 18122927. The next prime is 18122947. The reversal of 18122940 is 4922181.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18122947) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 160324 + ... + 160436.

It is an arithmetic number, because the mean of its divisors is an integer number (373806).

Almost surely, 2^18122940 is an apocalyptic number.

18122940 is a gapful number since it is divisible by the number (10) 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 18122940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31399704).

18122940 is an abundant number, since it is smaller than the sum of its proper divisors (44676468).

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

18122940 is a wasteful number, since it uses less digits than its factorization.

18122940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151 (or 134 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The square root of 18122940 is about 4257.1046498765. The cubic root of 18122940 is about 262.6694416237.

The spelling of 18122940 in words is "eighteen million, one hundred twenty-two thousand, nine hundred forty".