18630531940 has 12 divisors (see below), whose sum is σ = 39124117116. Its totient is φ = 7452212768.

The previous prime is 18630531911. The next prime is 18630531943. The reversal of 18630531940 is 4913503681.

It can be written as a sum of positive squares in 2 ways, for example, as 2989027584 + 15641504356 = 54672^2 + 125066^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18630531893 and 18630531902.

It is not an unprimeable number, because it can be changed into a prime (18630531943) 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 3 ways as a sum of consecutive naturals, for example, 465763279 + ... + 465763318.

It is an arithmetic number, because the mean of its divisors is an integer number (3260343093).

Almost surely, 2^18630531940 is an apocalyptic number.

18630531940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18630531940 is an abundant number, since it is smaller than the sum of its proper divisors (20493585176).

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

18630531940 is a wasteful number, since it uses less digits than its factorization.

18630531940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 931526606 (or 931526604 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 18630531940 in words is "eighteen billion, six hundred thirty million, five hundred thirty-one thousand, nine hundred forty".