18024720440 has 32 divisors (see below), whose sum is σ = 40559838480. Its totient is φ = 7209138432.

The previous prime is 18024720421. The next prime is 18024720449. The reversal of 18024720440 is 4402742081.

It is a junction number, because it is equal to n+sod(n) for n = 18024720397 and 18024720406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18024720449) 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, 523847 + ... + 557193.

Almost surely, 2^18024720440 is an apocalyptic number.

18024720440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18024720440 is an abundant number, since it is smaller than the sum of its proper divisors (22535118040).

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

18024720440 is a wasteful number, since it uses less digits than its factorization.

18024720440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46871 (or 46867 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 32.

The spelling of 18024720440 in words is "eighteen billion, twenty-four million, seven hundred twenty thousand, four hundred forty".