18921341 has 4 divisors (see below), whose sum is σ = 19744032. Its totient is φ = 18098652.

The previous prime is 18921337. The next prime is 18921347. The reversal of 18921341 is 14312981.

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 a cyclic number.

It is not a de Polignac number, because 18921341 - 2² = 18921337 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 (18921347) 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, 411311 + ... + 411356.

It is an arithmetic number, because the mean of its divisors is an integer number (4936008).

Almost surely, 2^18921341 is an apocalyptic number.

It is an amenable number.

18921341 is a deficient number, since it is larger than the sum of its proper divisors (822691).

18921341 is an equidigital number, since it uses as much as digits as its factorization.

18921341 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822690.

The product of its digits is 1728, while the sum is 29.

The square root of 18921341 is about 4349.8667795692. The cubic root of 18921341 is about 266.4714207966.

The spelling of 18921341 in words is "eighteen million, nine hundred twenty-one thousand, three hundred forty-one".