18197473 has 12 divisors (see below), whose sum is σ = 21383892. Its totient is φ = 15439200.

The previous prime is 18197453. The next prime is 18197549. The reversal of 18197473 is 37479181.

It can be written as a sum of positive squares in 2 ways, for example, as 16257024 + 1940449 = 4032^2 + 1393^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18197473 is a prime.

It is a super-2 number, since 2×18197473² = 662296047171458, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18197423) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 3111 + ... + 6787.

It is an arithmetic number, because the mean of its divisors is an integer number (1781991).

Almost surely, 2^18197473 is an apocalyptic number.

It is an amenable number.

18197473 is a deficient number, since it is larger than the sum of its proper divisors (3186419).

18197473 is a wasteful number, since it uses less digits than its factorization.

18197473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3792 (or 3785 counting only the distinct ones).

The product of its digits is 42336, while the sum is 40.

The square root of 18197473 is about 4265.8496222910. The cubic root of 18197473 is about 263.0290367782.

The spelling of 18197473 in words is "eighteen million, one hundred ninety-seven thousand, four hundred seventy-three".