18945888390 has 384 divisors, whose sum is σ = 61776691200. Its totient is φ = 4100025600.

The previous prime is 18945888277. The next prime is 18945888449. The reversal of 18945888390 is 9388854981.

It is a happy number.

18945888390 is a `hidden beast` number, since 18 + 9 + 4 + 588 + 8 + 39 + 0 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 13165291 + ... + 13166729.

It is an arithmetic number, because the mean of its divisors is an integer number (160876800).

Almost surely, 2^18945888390 is an apocalyptic number.

18945888390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18945888390, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30888345600).

18945888390 is an abundant number, since it is smaller than the sum of its proper divisors (42830802810).

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

18945888390 is a wasteful number, since it uses less digits than its factorization.

18945888390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1521 (or 1504 counting only the distinct ones).

The product of its (nonzero) digits is 19906560, while the sum is 63.

The spelling of 18945888390 in words is "eighteen billion, nine hundred forty-five million, eight hundred eighty-eight thousand, three hundred ninety".