18478498 has 4 divisors (see below), whose sum is σ = 27717750. Its totient is φ = 9239248.

The previous prime is 18478489. The next prime is 18478501. The reversal of 18478498 is 89487481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 89487481 = 521 ⋅171761.

It can be written as a sum of positive squares in only one way, i.e., 10543009 + 7935489 = 3247^2 + 2817^2 .

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 as a sum of consecutive naturals, namely, 4619623 + ... + 4619626.

Almost surely, 2^18478498 is an apocalyptic number.

18478498 is a deficient number, since it is larger than the sum of its proper divisors (9239252).

18478498 is an equidigital number, since it uses as much as digits as its factorization.

18478498 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9239251.

The product of its digits is 516096, while the sum is 49.

The square root of 18478498 is about 4298.6623500805. The cubic root of 18478498 is about 264.3761186978.

The spelling of 18478498 in words is "eighteen million, four hundred seventy-eight thousand, four hundred ninety-eight".