18804121 has 4 divisors (see below), whose sum is σ = 21490432. Its totient is φ = 16117812.

The previous prime is 18804119. The next prime is 18804131. The reversal of 18804121 is 12140881.

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: 12140881 = 1619 ⋅7499.

It is a cyclic number.

It is not a de Polignac number, because 18804121 - 2¹ = 18804119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18804131) 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, 1343145 + ... + 1343158.

It is an arithmetic number, because the mean of its divisors is an integer number (5372608).

Almost surely, 2^18804121 is an apocalyptic number.

It is an amenable number.

18804121 is a deficient number, since it is larger than the sum of its proper divisors (2686311).

18804121 is an equidigital number, since it uses as much as digits as its factorization.

18804121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2686310.

The product of its (nonzero) digits is 512, while the sum is 25.

The square root of 18804121 is about 4336.3718705849. The cubic root of 18804121 is about 265.9200062850.

The spelling of 18804121 in words is "eighteen million, eight hundred four thousand, one hundred twenty-one".