18012723040 has 144 divisors (see below), whose sum is σ = 46384764048. Its totient is φ = 6606931968.

The previous prime is 18012723017. The next prime is 18012723041. The reversal of 18012723040 is 4032721081.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18012723041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4243159 + ... + 4247401.

It is an arithmetic number, because the mean of its divisors is an integer number (322116417).

Almost surely, 2^18012723040 is an apocalyptic number.

18012723040 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 18012723040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23192382024).

18012723040 is an abundant number, since it is smaller than the sum of its proper divisors (28372041008).

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

18012723040 is a wasteful number, since it uses less digits than its factorization.

18012723040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4441 (or 4420 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 28.

The spelling of 18012723040 in words is "eighteen billion, twelve million, seven hundred twenty-three thousand, forty".