18478845 has 48 divisors (see below), whose sum is σ = 39940992. Its totient is φ = 7678080.

The previous prime is 18478843. The next prime is 18478853. The reversal of 18478845 is 54887481.

It is not a de Polignac number, because 18478845 - 2¹ = 18478843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18478845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18478843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 799 + ... + 6131.

It is an arithmetic number, because the mean of its divisors is an integer number (832104).

Almost surely, 2^18478845 is an apocalyptic number.

18478845 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18478845 is an abundant number, since it is smaller than the sum of its proper divisors (21462147).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18478845 is a wasteful number, since it uses less digits than its factorization.

18478845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5362 (or 5359 counting only the distinct ones).

The product of its digits is 286720, while the sum is 45.

The square root of 18478845 is about 4298.7027112840. The cubic root of 18478845 is about 264.3777735571.

The spelling of 18478845 in words is "eighteen million, four hundred seventy-eight thousand, eight hundred forty-five".