18391890562240 has 448 divisors, whose sum is σ = 48707866666368. Its totient is φ = 6571553587200.

The previous prime is 18391890562183. The next prime is 18391890562247. The reversal of 18391890562240 is 4226509819381.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18391890562247) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 23369619127 + ... + 23369619913.

It is an arithmetic number, because the mean of its divisors is an integer number (108722916666).

Almost surely, 2^{18391890562240} is an apocalyptic number.

18391890562240 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 18391890562240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24353933333184).

18391890562240 is an abundant number, since it is smaller than the sum of its proper divisors (30315976104128).

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

18391890562240 is a wasteful number, since it uses less digits than its factorization.

18391890562240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1796 (or 1786 counting only the distinct ones).

The product of its (nonzero) digits is 7464960, while the sum is 58.

The spelling of 18391890562240 in words is "eighteen trillion, three hundred ninety-one billion, eight hundred ninety million, five hundred sixty-two thousand, two hundred forty".