18380889842436 has 405 divisors, whose sum is σ = 53873857924887. Its totient is φ = 5460640621920.

The previous prime is 18380889842407. The next prime is 18380889842443. The reversal of 18380889842436 is 63424898808381.

The square root of 18380889842436 is 4287294.

It is a perfect power (a square), and thus also a powerful number.

18380889842436 is a `hidden beast` number, since 1 + 8 + 3 + 8 + 0 + 88 + 98 + 424 + 36 = 666.

It is a super-2 number, since 2×18380889842436² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

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 134 ways as a sum of consecutive naturals, for example, 50084168325 + ... + 50084168691.

Almost surely, 2^{18380889842436} is an apocalyptic number.

18380889842436 is the 4287294-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18380889842436

18380889842436 is an abundant number, since it is smaller than the sum of its proper divisors (35492968082451).

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

18380889842436 is an equidigital number, since it uses as much as digits as its factorization.

18380889842436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 890 (or 442 counting only the distinct ones).

The product of its (nonzero) digits is 509607936, while the sum is 72.

The spelling of 18380889842436 in words is "eighteen trillion, three hundred eighty billion, eight hundred eighty-nine million, eight hundred forty-two thousand, four hundred thirty-six".