18478738 has 8 divisors (see below), whose sum is σ = 27785520. Its totient is φ = 9216900.

The previous prime is 18478727. The next prime is 18478751. The reversal of 18478738 is 83787481.

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

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 10188 + ... + 11863.

It is an arithmetic number, because the mean of its divisors is an integer number (3473190).

Almost surely, 2^18478738 is an apocalyptic number.

18478738 is a deficient number, since it is larger than the sum of its proper divisors (9306782).

18478738 is a wasteful number, since it uses less digits than its factorization.

18478738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22472.

The product of its digits is 301056, while the sum is 46.

The square root of 18478738 is about 4298.6902656507. The cubic root of 18478738 is about 264.3772632713.

It can be divided in two parts, 1847 and 8738, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 18478738 in words is "eighteen million, four hundred seventy-eight thousand, seven hundred thirty-eight".