18441978252 has 24 divisors (see below), whose sum is σ = 43946843136. Its totient is φ = 6016531728.

The previous prime is 18441978127. The next prime is 18441978253. The reversal of 18441978252 is 25287914481.

It is a junction number, because it is equal to n+sod(n) for n = 18441978195 and 18441978204.

It is not an unprimeable number, because it can be changed into a prime (18441978253) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16348708 + ... + 16349835.

It is an arithmetic number, because the mean of its divisors is an integer number (1831118464).

Almost surely, 2^18441978252 is an apocalyptic number.

18441978252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18441978252 is an abundant number, since it is smaller than the sum of its proper divisors (25504864884).

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

18441978252 is a wasteful number, since it uses less digits than its factorization.

18441978252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32698597 (or 32698595 counting only the distinct ones).

The product of its digits is 1290240, while the sum is 51.

The spelling of 18441978252 in words is "eighteen billion, four hundred forty-one million, nine hundred seventy-eight thousand, two hundred fifty-two".