18900227 has 8 divisors (see below), whose sum is σ = 19765536. Its totient is φ = 18038592.

The previous prime is 18900223. The next prime is 18900239. The reversal of 18900227 is 72200981.

It is a happy number.

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 18900227 - 2² = 18900223 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18900227.

It is not an unprimeable number, because it can be changed into a prime (18900223) 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, 19703 + ... + 20639.

It is an arithmetic number, because the mean of its divisors is an integer number (2470692).

Almost surely, 2^18900227 is an apocalyptic number.

18900227 is a deficient number, since it is larger than the sum of its proper divisors (865309).

18900227 is an equidigital number, since it uses as much as digits as its factorization.

18900227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1837.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18900227 is about 4347.4391312588. The cubic root of 18900227 is about 266.3722669429.

The spelling of 18900227 in words is "eighteen million, nine hundred thousand, two hundred twenty-seven".