1816538448 has 20 divisors (see below), whose sum is σ = 4692724448. Its totient is φ = 605512800.

The previous prime is 1816538443. The next prime is 1816538501. The reversal of 1816538448 is 8448356181.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 37844551 = 1816538448 / (1 + 8 + 1 + 6 + 5 + 3 + 8 + 4 + 4 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 1816538397 and 1816538406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816538443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18922228 + ... + 18922323.

Almost surely, 2^1816538448 is an apocalyptic number.

It is an amenable number.

1816538448 is an abundant number, since it is smaller than the sum of its proper divisors (2876186000).

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

1816538448 is a wasteful number, since it uses less digits than its factorization.

1816538448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37844562 (or 37844556 counting only the distinct ones).

The product of its digits is 737280, while the sum is 48.

The square root of 1816538448 is about 42620.8686912878. The cubic root of 1816538448 is about 1220.1546090898.

The spelling of 1816538448 in words is "one billion, eight hundred sixteen million, five hundred thirty-eight thousand, four hundred forty-eight".