18481917 has 4 divisors (see below), whose sum is σ = 24642560. Its totient is φ = 12321276.

The previous prime is 18481913. The next prime is 18481919. The reversal of 18481917 is 71918481.

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 18481917 - 2² = 18481913 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 (18481913) 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, 3080317 + ... + 3080322.

It is an arithmetic number, because the mean of its divisors is an integer number (6160640).

Almost surely, 2^18481917 is an apocalyptic number.

It is an amenable number.

18481917 is a deficient number, since it is larger than the sum of its proper divisors (6160643).

18481917 is an equidigital number, since it uses as much as digits as its factorization.

18481917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6160642.

The product of its digits is 16128, while the sum is 39.

The square root of 18481917 is about 4299.0600135378. The cubic root of 18481917 is about 264.3924231653.

The spelling of 18481917 in words is "eighteen million, four hundred eighty-one thousand, nine hundred seventeen".