18448385 has 8 divisors (see below), whose sum is σ = 22736616. Its totient is φ = 14359680.

The previous prime is 18448361. The next prime is 18448387. The reversal of 18448385 is 58384481.

It can be written as a sum of positive squares in 4 ways, for example, as 4190209 + 14258176 = 2047^2 + 3776^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18448385 - 2¹² = 18444289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18448387) 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, 49676 + ... + 50045.

It is an arithmetic number, because the mean of its divisors is an integer number (2842077).

It is a Proth number, since it is equal to 563 ⋅ 2¹⁵ + 1 and 563 < 2¹⁵.

Almost surely, 2^18448385 is an apocalyptic number.

It is an amenable number.

18448385 is a deficient number, since it is larger than the sum of its proper divisors (4288231).

18448385 is an equidigital number, since it uses as much as digits as its factorization.

18448385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99763.

The product of its digits is 122880, while the sum is 41.

The square root of 18448385 is about 4295.1583207142. The cubic root of 18448385 is about 264.2324294119.

The spelling of 18448385 in words is "eighteen million, four hundred forty-eight thousand, three hundred eighty-five".