18198473 has 4 divisors (see below), whose sum is σ = 18470160. Its totient is φ = 17926788.

The previous prime is 18198469. The next prime is 18198493. The reversal of 18198473 is 37489181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 18198473 - 2² = 18198469 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18198473.

It is not an unprimeable number, because it can be changed into a prime (18198493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 135743 + ... + 135876.

It is an arithmetic number, because the mean of its divisors is an integer number (4617540).

Almost surely, 2^18198473 is an apocalyptic number.

It is an amenable number.

18198473 is a deficient number, since it is larger than the sum of its proper divisors (271687).

18198473 is an equidigital number, since it uses as much as digits as its factorization.

18198473 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271686.

The product of its digits is 48384, while the sum is 41.

The square root of 18198473 is about 4265.9668306259. The cubic root of 18198473 is about 263.0338547406.

The spelling of 18198473 in words is "eighteen million, one hundred ninety-eight thousand, four hundred seventy-three".