18227887 has 2 divisors, whose sum is σ = 18227888. Its totient is φ = 18227886.

The previous prime is 18227851. The next prime is 18227933. The reversal of 18227887 is 78872281.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 18227887 - 2¹¹ = 18225839 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18227087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9113943 + 9113944.

It is an arithmetic number, because the mean of its divisors is an integer number (9113944).

Almost surely, 2^18227887 is an apocalyptic number.

18227887 is a deficient number, since it is larger than the sum of its proper divisors (1).

18227887 is an equidigital number, since it uses as much as digits as its factorization.

18227887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100352, while the sum is 43.

The square root of 18227887 is about 4269.4129573046. The cubic root of 18227887 is about 263.1754914079.

The spelling of 18227887 in words is "eighteen million, two hundred twenty-seven thousand, eight hundred eighty-seven".