18478747 has 8 divisors (see below), whose sum is σ = 21220352. Its totient is φ = 15762600.

The previous prime is 18478727. The next prime is 18478751. The reversal of 18478747 is 74787481.

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

It is not a de Polignac number, because 18478747 - 2⁷ = 18478619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18478697 and 18478706.

It is not an unprimeable number, because it can be changed into a prime (18478727) 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, 4779 + ... + 7732.

It is an arithmetic number, because the mean of its divisors is an integer number (2652544).

Almost surely, 2^18478747 is an apocalyptic number.

18478747 is a deficient number, since it is larger than the sum of its proper divisors (2741605).

18478747 is a wasteful number, since it uses less digits than its factorization.

18478747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12729.

The product of its digits is 351232, while the sum is 46.

The square root of 18478747 is about 4298.6913124810. The cubic root of 18478747 is about 264.3773061926.

It can be divided in two parts, 1 and 8478747, that added together give a palindrome (8478748).

The spelling of 18478747 in words is "eighteen million, four hundred seventy-eight thousand, seven hundred forty-seven".