18390749050240 has 128 divisors (see below), whose sum is σ = 50266115565120. Its totient is φ = 6302894653440.

The previous prime is 18390749050183. The next prime is 18390749050243. The reversal of 18390749050240 is 4205094709381.

It is a tau number, because it is divible by the number of its divisors (128).

It is a hoax number, since the sum of its digits (52) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18390749050243) 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 15 ways as a sum of consecutive naturals, for example, 10479904 + ... + 12108256.

Almost surely, 2^{18390749050240} is an apocalyptic number.

18390749050240 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 18390749050240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25133057782560).

18390749050240 is an abundant number, since it is smaller than the sum of its proper divisors (31875366514880).

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

18390749050240 is a wasteful number, since it uses less digits than its factorization.

18390749050240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1630900 (or 1630888 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 52.

The spelling of 18390749050240 in words is "eighteen trillion, three hundred ninety billion, seven hundred forty-nine million, fifty thousand, two hundred forty".