18909201 has 8 divisors (see below), whose sum is σ = 25249600. Its totient is φ = 12587472.

The previous prime is 18909173. The next prime is 18909221. The reversal of 18909201 is 10290981.

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

It is not a de Polignac number, because 18909201 - 2¹¹ = 18907153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18909221) 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, 2101 + ... + 6498.

It is an arithmetic number, because the mean of its divisors is an integer number (3156200).

Almost surely, 2^18909201 is an apocalyptic number.

It is an amenable number.

18909201 is a deficient number, since it is larger than the sum of its proper divisors (6340399).

18909201 is an equidigital number, since it uses as much as digits as its factorization.

18909201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9335.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 18909201 is about 4348.4711106319. The cubic root of 18909201 is about 266.4144189321.

It can be divided in two parts, 18909 and 201, that added together give a triangular number (19110 = T₁₉₅).

The spelling of 18909201 in words is "eighteen million, nine hundred nine thousand, two hundred one".