18227089 has 4 divisors (see below), whose sum is σ = 18394420. Its totient is φ = 18059760.

The previous prime is 18227087. The next prime is 18227093. The reversal of 18227089 is 98072281.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98072281 = 19 ⋅5161699.

It can be written as a sum of positive squares in 2 ways, for example, as 11937025 + 6290064 = 3455^2 + 2508^2 .

It is a cyclic number.

It is not a de Polignac number, because 18227089 - 2¹ = 18227087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18227081) 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, 83502 + ... + 83719.

It is an arithmetic number, because the mean of its divisors is an integer number (4598605).

Almost surely, 2^18227089 is an apocalyptic number.

It is an amenable number.

18227089 is a deficient number, since it is larger than the sum of its proper divisors (167331).

18227089 is a wasteful number, since it uses less digits than its factorization.

18227089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167330.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 18227089 is about 4269.3195008104. The cubic root of 18227089 is about 263.1716508255.

It can be divided in two parts, 1822 and 7089, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 18227089 in words is "eighteen million, two hundred twenty-seven thousand, eighty-nine".