18228265 has 8 divisors (see below), whose sum is σ = 23862528. Its totient is φ = 13256880.

The previous prime is 18228263. The next prime is 18228281. The reversal of 18228265 is 56282281.

18228265 = T₁₈₁₅ + T₁₈₁₆ + ... + T₁₈₂₅.

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

It is not a de Polignac number, because 18228265 - 2¹ = 18228263 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 18228265.

It is not an unprimeable number, because it can be changed into a prime (18228263) 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, 165657 + ... + 165766.

It is an arithmetic number, because the mean of its divisors is an integer number (2982816).

Almost surely, 2^18228265 is an apocalyptic number.

It is an amenable number.

18228265 is a deficient number, since it is larger than the sum of its proper divisors (5634263).

18228265 is a wasteful number, since it uses less digits than its factorization.

18228265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331439.

The product of its digits is 15360, while the sum is 34.

The square root of 18228265 is about 4269.4572254562. The cubic root of 18228265 is about 263.1773105920.

The spelling of 18228265 in words is "eighteen million, two hundred twenty-eight thousand, two hundred sixty-five".