18226969 has 4 divisors (see below), whose sum is σ = 18650896. Its totient is φ = 17803044.

The previous prime is 18226951. The next prime is 18226987. The reversal of 18226969 is 96962281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is an interprime number because it is at equal distance from previous prime (18226951) and next prime (18226987).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18226969 is a prime.

It is a super-2 number, since 2×18226969² = 664444797853922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 423883 = 18226969 / (1 + 8 + 2 + 2 + 6 + 9 + 6 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18226469) 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, 211899 + ... + 211984.

It is an arithmetic number, because the mean of its divisors is an integer number (4662724).

Almost surely, 2^18226969 is an apocalyptic number.

It is an amenable number.

18226969 is a deficient number, since it is larger than the sum of its proper divisors (423927).

18226969 is an equidigital number, since it uses as much as digits as its factorization.

18226969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423926.

The product of its digits is 93312, while the sum is 43.

The square root of 18226969 is about 4269.3054470253. The cubic root of 18226969 is about 263.1710732846.

The spelling of 18226969 in words is "eighteen million, two hundred twenty-six thousand, nine hundred sixty-nine".