18438485 has 8 divisors (see below), whose sum is σ = 23828280. Its totient is φ = 13616064.

The previous prime is 18438481. The next prime is 18438491. The reversal of 18438485 is 58483481.

It can be written as a sum of positive squares in 4 ways, for example, as 49 + 18438436 = 7^2 + 4294^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 18438485 - 2² = 18438481 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18438481) 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, 141770 + ... + 141899.

It is an arithmetic number, because the mean of its divisors is an integer number (2978535).

Almost surely, 2^18438485 is an apocalyptic number.

It is an amenable number.

18438485 is a deficient number, since it is larger than the sum of its proper divisors (5389795).

18438485 is a wasteful number, since it uses less digits than its factorization.

18438485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 283687.

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

The square root of 18438485 is about 4294.0057056320. The cubic root of 18438485 is about 264.1851557325.

The spelling of 18438485 in words is "eighteen million, four hundred thirty-eight thousand, four hundred eighty-five".