18478474 has 16 divisors (see below), whose sum is σ = 31890816. Its totient is φ = 7866000.

The previous prime is 18478463. The next prime is 18478477. The reversal of 18478474 is 47487481.

It is a self number, because there is not a number n which added to its sum of digits gives 18478474.

It is not an unprimeable number, because it can be changed into a prime (18478477) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2257 + ... + 6484.

It is an arithmetic number, because the mean of its divisors is an integer number (1993176).

Almost surely, 2^18478474 is an apocalyptic number.

18478474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18478474 is a deficient number, since it is larger than the sum of its proper divisors (13412342).

18478474 is a wasteful number, since it uses less digits than its factorization.

18478474 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8901.

The product of its digits is 200704, while the sum is 43.

The square root of 18478474 is about 4298.6595585136. The cubic root of 18478474 is about 264.3760042400.

The spelling of 18478474 in words is "eighteen million, four hundred seventy-eight thousand, four hundred seventy-four".