18454217 has 4 divisors (see below), whose sum is σ = 18556356. Its totient is φ = 18352080.

The previous prime is 18454213. The next prime is 18454253. The reversal of 18454217 is 71245481.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 9388096 + 9066121 = 3064^2 + 3011^2 .

It is a cyclic number.

It is not a de Polignac number, because 18454217 - 2² = 18454213 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18454213) 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, 50798 + ... + 51159.

It is an arithmetic number, because the mean of its divisors is an integer number (4639089).

Almost surely, 2^18454217 is an apocalyptic number.

It is an amenable number.

18454217 is a deficient number, since it is larger than the sum of its proper divisors (102139).

18454217 is a wasteful number, since it uses less digits than its factorization.

18454217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102138.

The product of its digits is 8960, while the sum is 32.

The square root of 18454217 is about 4295.8371710296. The cubic root of 18454217 is about 264.2602699912.

Adding to 18454217 its reverse (71245481), we get a palindrome (89699698).

The spelling of 18454217 in words is "eighteen million, four hundred fifty-four thousand, two hundred seventeen".