18454873 has 4 divisors (see below), whose sum is σ = 18536400. Its totient is φ = 18373348.

The previous prime is 18454867. The next prime is 18454883. The reversal of 18454873 is 37845481.

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, and also an emirpimes, since its reverse is a distinct semiprime: 37845481 = 47 ⋅805223.

It is a cyclic number.

It is not a de Polignac number, because 18454873 - 2⁹ = 18454361 is a prime.

It is a super-2 number, since 2×18454873² = 681164674892258, 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 a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18454883) 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, 40423 + ... + 40876.

It is an arithmetic number, because the mean of its divisors is an integer number (4634100).

Almost surely, 2^18454873 is an apocalyptic number.

It is an amenable number.

18454873 is a deficient number, since it is larger than the sum of its proper divisors (81527).

18454873 is an equidigital number, since it uses as much as digits as its factorization.

18454873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81526.

The product of its digits is 107520, while the sum is 40.

The square root of 18454873 is about 4295.9135233382. The cubic root of 18454873 is about 264.2634012120.

The spelling of 18454873 in words is "eighteen million, four hundred fifty-four thousand, eight hundred seventy-three".