18712598436 has 81 divisors (see below), whose sum is σ = 55040849409. Its totient is φ = 5344815168.

The previous prime is 18712598431. The next prime is 18712598459. The reversal of 18712598436 is 63489521781.

The square root of 18712598436 is 136794.

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

18712598436 is a `hidden beast` number, since 1 + 8 + 7 + 1 + 2 + 598 + 43 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 16035156900 + 2677441536 = 126630^2 + 51744^2 .

It is a super-2 number, since 2×18712598436² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18712598431) 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 26 ways as a sum of consecutive naturals, for example, 5743720 + ... + 5746976.

Almost surely, 2^18712598436 is an apocalyptic number.

18712598436 is the 136794-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18712598436

18712598436 is an abundant number, since it is smaller than the sum of its proper divisors (36328250973).

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

18712598436 is an equidigital number, since it uses as much as digits as its factorization.

18712598436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6538 (or 3269 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The spelling of 18712598436 in words is "eighteen billion, seven hundred twelve million, five hundred ninety-eight thousand, four hundred thirty-six".