18189257490 has 48 divisors (see below), whose sum is σ = 47394763416. Its totient is φ = 4839936000.

The previous prime is 18189257483. The next prime is 18189257501. The reversal of 18189257490 is 9475298181.

It is a happy number.

18189257490 is a `hidden beast` number, since 1 + 8 + 18 + 92 + 57 + 490 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 9435596769 + 8753660721 = 97137^2 + 93561^2 .

It is a super-2 number, since 2×18189257490² (a number of 21 digits) contains 22 as substring.

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 23 ways as a sum of consecutive naturals, for example, 177711 + ... + 260690.

Almost surely, 2^18189257490 is an apocalyptic number.

18189257490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18189257490 is an abundant number, since it is smaller than the sum of its proper divisors (29205505926).

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

18189257490 is a wasteful number, since it uses less digits than its factorization.

18189257490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 438875 (or 438872 counting only the distinct ones).

The product of its (nonzero) digits is 1451520, while the sum is 54.

The spelling of 18189257490 in words is "eighteen billion, one hundred eighty-nine million, two hundred fifty-seven thousand, four hundred ninety".