18411973 has 4 divisors (see below), whose sum is σ = 18633888. Its totient is φ = 18190060.

The previous prime is 18411961. The next prime is 18411979. The reversal of 18411973 is 37911481.

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 18411973 - 2⁵ = 18411941 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 (18411979) 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, 110833 + ... + 110998.

It is an arithmetic number, because the mean of its divisors is an integer number (4658472).

Almost surely, 2^18411973 is an apocalyptic number.

It is an amenable number.

18411973 is a deficient number, since it is larger than the sum of its proper divisors (221915).

18411973 is an equidigital number, since it uses as much as digits as its factorization.

18411973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221914.

The product of its digits is 6048, while the sum is 34.

The square root of 18411973 is about 4290.9175009548. The cubic root of 18411973 is about 264.0584743828.

The spelling of 18411973 in words is "eighteen million, four hundred eleven thousand, nine hundred seventy-three".