18485438972 has 48 divisors (see below), whose sum is σ = 43434327552. Its totient is φ = 6648108480.

The previous prime is 18485438953. The next prime is 18485438977. The reversal of 18485438972 is 27983458481.

It is a super-2 number, since 2×18485438972² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18485438977) 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 15 ways as a sum of consecutive naturals, for example, 2304368 + ... + 2312375.

It is an arithmetic number, because the mean of its divisors is an integer number (904881824).

Almost surely, 2^18485438972 is an apocalyptic number.

It is an amenable number.

18485438972 is an abundant number, since it is smaller than the sum of its proper divisors (24948888580).

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

18485438972 is a wasteful number, since it uses less digits than its factorization.

18485438972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4616778 (or 4616776 counting only the distinct ones).

The product of its digits is 15482880, while the sum is 59.

The spelling of 18485438972 in words is "eighteen billion, four hundred eighty-five million, four hundred thirty-eight thousand, nine hundred seventy-two".