18972205 has 8 divisors (see below), whose sum is σ = 26019072. Its totient is φ = 13009488.

The previous prime is 18972199. The next prime is 18972229. The reversal of 18972205 is 50227981.

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

It is a cyclic number.

It is not a de Polignac number, because 18972205 - 2⁷ = 18972077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270997 + ... + 271066.

It is an arithmetic number, because the mean of its divisors is an integer number (3252384).

Almost surely, 2^18972205 is an apocalyptic number.

It is an amenable number.

18972205 is a deficient number, since it is larger than the sum of its proper divisors (7046867).

18972205 is an equidigital number, since it uses as much as digits as its factorization.

18972205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542075.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 18972205 is about 4355.7094714868. The cubic root of 18972205 is about 266.7099816792.

The spelling of 18972205 in words is "eighteen million, nine hundred seventy-two thousand, two hundred five".