18539484252 has 12 divisors (see below), whose sum is σ = 43258796616. Its totient is φ = 6179828080.

The previous prime is 18539484241. The next prime is 18539484253. The reversal of 18539484252 is 25248493581.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 18539484195 and 18539484204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18539484253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 772478499 + ... + 772478522.

It is an arithmetic number, because the mean of its divisors is an integer number (3604899718).

Almost surely, 2^18539484252 is an apocalyptic number.

18539484252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18539484252 is an abundant number, since it is smaller than the sum of its proper divisors (24719312364).

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

18539484252 is a wasteful number, since it uses less digits than its factorization.

18539484252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1544957028 (or 1544957026 counting only the distinct ones).

The product of its digits is 2764800, while the sum is 51.

The spelling of 18539484252 in words is "eighteen billion, five hundred thirty-nine million, four hundred eighty-four thousand, two hundred fifty-two".