18539484240 has 320 divisors, whose sum is σ = 61196083200. Its totient is φ = 4635789312.

The previous prime is 18539484209. The next prime is 18539484241. The reversal of 18539484240 is 4248493581.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18539484240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18539484241) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38704321 + ... + 38704799.

It is an arithmetic number, because the mean of its divisors is an integer number (191237760).

Almost surely, 2^18539484240 is an apocalyptic number.

18539484240 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 18539484240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30598041600).

18539484240 is an abundant number, since it is smaller than the sum of its proper divisors (42656598960).

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

18539484240 is a wasteful number, since it uses less digits than its factorization.

18539484240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674 (or 668 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 48.

The spelling of 18539484240 in words is "eighteen billion, five hundred thirty-nine million, four hundred eighty-four thousand, two hundred forty".