18236722140 has 288 divisors, whose sum is σ = 68216279040. Its totient is φ = 3840265728.

The previous prime is 18236722117. The next prime is 18236722159. The reversal of 18236722140 is 4122763281.

It is a happy number.

18236722140 is a `hidden beast` number, since 1 + 82 + 367 + 2 + 214 + 0 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 18236722095 and 18236722104.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 13742157 + ... + 13743483.

It is an arithmetic number, because the mean of its divisors is an integer number (236862080).

Almost surely, 2^18236722140 is an apocalyptic number.

18236722140 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 18236722140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34108139520).

18236722140 is an abundant number, since it is smaller than the sum of its proper divisors (49979556900).

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

18236722140 is a wasteful number, since it uses less digits than its factorization.

18236722140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2201 (or 2196 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The spelling of 18236722140 in words is "eighteen billion, two hundred thirty-six million, seven hundred twenty-two thousand, one hundred forty".