18343509240 has 512 divisors, whose sum is σ = 68584734720. Its totient is φ = 3833837568.

The previous prime is 18343509227. The next prime is 18343509241. The reversal of 18343509240 is 4290534381.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18343509241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 47894089 + ... + 47894471.

It is an arithmetic number, because the mean of its divisors is an integer number (133954560).

Almost surely, 2^18343509240 is an apocalyptic number.

18343509240 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 18343509240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34292367360).

18343509240 is an abundant number, since it is smaller than the sum of its proper divisors (50241225480).

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

18343509240 is a wasteful number, since it uses less digits than its factorization.

18343509240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 531 (or 527 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 39.

The spelling of 18343509240 in words is "eighteen billion, three hundred forty-three million, five hundred nine thousand, two hundred forty".