18227313 has 24 divisors (see below), whose sum is σ = 29020992. Its totient is φ = 10952928.

The previous prime is 18227311. The next prime is 18227317. The reversal of 18227313 is 31372281.

It is not a de Polignac number, because 18227313 - 2¹ = 18227311 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18227311) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3220 + ... + 6842.

It is an arithmetic number, because the mean of its divisors is an integer number (1209208).

Almost surely, 2^18227313 is an apocalyptic number.

18227313 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18227313 is a deficient number, since it is larger than the sum of its proper divisors (10793679).

18227313 is a wasteful number, since it uses less digits than its factorization.

18227313 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3685 (or 3682 counting only the distinct ones).

The product of its digits is 2016, while the sum is 27.

The square root of 18227313 is about 4269.3457344188. The cubic root of 18227313 is about 263.1727288950.

Adding to 18227313 its reverse (31372281), we get a palindrome (49599594).

It can be divided in two parts, 182 and 27313, that added together give a triangular number (27495 = T₂₃₄).

The spelling of 18227313 in words is "eighteen million, two hundred twenty-seven thousand, three hundred thirteen".