18478090 has 8 divisors (see below), whose sum is σ = 33260580. Its totient is φ = 7391232.

The previous prime is 18478081. The next prime is 18478093. The reversal of 18478090 is 9087481.

It can be written as a sum of positive squares in 2 ways, for example, as 17464041 + 1014049 = 4179^2 + 1007^2 .

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

It is not an unprimeable number, because it can be changed into a prime (18478093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 923895 + ... + 923914.

Almost surely, 2^18478090 is an apocalyptic number.

18478090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18478090 is a deficient number, since it is larger than the sum of its proper divisors (14782490).

18478090 is a wasteful number, since it uses less digits than its factorization.

18478090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1847816.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18478090 is about 4298.6148931952. The cubic root of 18478090 is about 264.3741729003.

The spelling of 18478090 in words is "eighteen million, four hundred seventy-eight thousand, ninety".