18713121 has 8 divisors (see below), whose sum is σ = 28515264. Its totient is φ = 10693200.

The previous prime is 18713117. The next prime is 18713129. The reversal of 18713121 is 12131781.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18713121 - 2² = 18713117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18713091 and 18713100.

It is not an unprimeable number, because it can be changed into a prime (18713129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 445530 + ... + 445571.

It is an arithmetic number, because the mean of its divisors is an integer number (3564408).

Almost surely, 2^18713121 is an apocalyptic number.

It is an amenable number.

18713121 is a deficient number, since it is larger than the sum of its proper divisors (9802143).

18713121 is an equidigital number, since it uses as much as digits as its factorization.

18713121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891111.

The product of its digits is 336, while the sum is 24.

The square root of 18713121 is about 4325.8665027946. The cubic root of 18713121 is about 265.4903511519.

The spelling of 18713121 in words is "eighteen million, seven hundred thirteen thousand, one hundred twenty-one".