18128473 has 8 divisors (see below), whose sum is σ = 19824480. Its totient is φ = 16440480.

The previous prime is 18128471. The next prime is 18128479. The reversal of 18128473 is 37482181.

It is a happy number.

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 18128473 - 2¹ = 18128471 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18128471) 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, 3373 + ... + 6901.

It is an arithmetic number, because the mean of its divisors is an integer number (2478060).

Almost surely, 2^18128473 is an apocalyptic number.

It is an amenable number.

18128473 is a deficient number, since it is larger than the sum of its proper divisors (1696007).

18128473 is a wasteful number, since it uses less digits than its factorization.

18128473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4007.

The product of its digits is 10752, while the sum is 34.

The square root of 18128473 is about 4257.7544551089. The cubic root of 18128473 is about 262.6961702181.

The spelling of 18128473 in words is "eighteen million, one hundred twenty-eight thousand, four hundred seventy-three".