18472117 has 4 divisors (see below), whose sum is σ = 18528256. Its totient is φ = 18415980.

The previous prime is 18472109. The next prime is 18472163. The reversal of 18472117 is 71127481.

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: 71127481 = 97 ⋅733273.

It is a cyclic number.

It is not a de Polignac number, because 18472117 - 2³ = 18472109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18479117) 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, 27573 + ... + 28234.

It is an arithmetic number, because the mean of its divisors is an integer number (4632064).

Almost surely, 2^18472117 is an apocalyptic number.

It is an amenable number.

18472117 is a deficient number, since it is larger than the sum of its proper divisors (56139).

18472117 is an equidigital number, since it uses as much as digits as its factorization.

18472117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56138.

The product of its digits is 3136, while the sum is 31.

The square root of 18472117 is about 4297.9200783635. The cubic root of 18472117 is about 264.3456837164.

Adding to 18472117 its reverse (71127481), we get a palindrome (89599598).

The spelling of 18472117 in words is "eighteen million, four hundred seventy-two thousand, one hundred seventeen".