18459418 has 4 divisors (see below), whose sum is σ = 27689130. Its totient is φ = 9229708.

The previous prime is 18459407. The next prime is 18459473. The reversal of 18459418 is 81495481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 13935289 + 4524129 = 3733^2 + 2127^2 .

It is a super-2 number, since 2×18459418² = 681500225797448, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4614853 + ... + 4614856.

Almost surely, 2^18459418 is an apocalyptic number.

18459418 is a deficient number, since it is larger than the sum of its proper divisors (9229712).

18459418 is an equidigital number, since it uses as much as digits as its factorization.

18459418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9229711.

The product of its digits is 46080, while the sum is 40.

The square root of 18459418 is about 4296.4424818680. The cubic root of 18459418 is about 264.2850933792.

The spelling of 18459418 in words is "eighteen million, four hundred fifty-nine thousand, four hundred eighteen".