18438055 has 16 divisors (see below), whose sum is σ = 23133600. Its totient is φ = 14089600.

The previous prime is 18438029. The next prime is 18438059. The reversal of 18438055 is 55083481.

It is not a de Polignac number, because 18438055 - 2⁵ = 18438023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18438055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18438059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14016 + ... + 15274.

It is an arithmetic number, because the mean of its divisors is an integer number (1445850).

Almost surely, 2^18438055 is an apocalyptic number.

18438055 is a deficient number, since it is larger than the sum of its proper divisors (4695545).

18438055 is a wasteful number, since it uses less digits than its factorization.

18438055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1394.

The product of its (nonzero) digits is 19200, while the sum is 34.

The square root of 18438055 is about 4293.9556355417. The cubic root of 18438055 is about 264.1831020479.

The spelling of 18438055 in words is "eighteen million, four hundred thirty-eight thousand, fifty-five".