18222765 has 16 divisors (see below), whose sum is σ = 31807296. Its totient is φ = 8835200.

The previous prime is 18222751. The next prime is 18222769. The reversal of 18222765 is 56722281.

It is not a de Polignac number, because 18222765 - 2⁴ = 18222749 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18222769) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55056 + ... + 55385.

It is an arithmetic number, because the mean of its divisors is an integer number (1987956).

Almost surely, 2^18222765 is an apocalyptic number.

18222765 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18222765 is a deficient number, since it is larger than the sum of its proper divisors (13584531).

18222765 is a wasteful number, since it uses less digits than its factorization.

18222765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110460.

The product of its digits is 13440, while the sum is 33.

The square root of 18222765 is about 4268.8130668840. The cubic root of 18222765 is about 263.1508385020.

It can be divided in two parts, 1822276 and 5, that added together give a palindrome (1822281).

The spelling of 18222765 in words is "eighteen million, two hundred twenty-two thousand, seven hundred sixty-five".