18229689 has 12 divisors (see below), whose sum is σ = 26450736. Its totient is φ = 12098232.

The previous prime is 18229681. The next prime is 18229691. The reversal of 18229689 is 98692281.

It is not a de Polignac number, because 18229689 - 2³ = 18229681 is a prime.

It is a super-2 number, since 2×18229689² = 664643122073442, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18229681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2419 + ... + 6504.

It is an arithmetic number, because the mean of its divisors is an integer number (2204228).

Almost surely, 2^18229689 is an apocalyptic number.

It is an amenable number.

18229689 is a deficient number, since it is larger than the sum of its proper divisors (8221047).

18229689 is a wasteful number, since it uses less digits than its factorization.

18229689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9156 (or 9153 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 18229689 is about 4269.6239881282. The cubic root of 18229689 is about 263.1841635889.

It can be divided in two parts, 1822 and 9689, that added together give a palindrome (11511).

The spelling of 18229689 in words is "eighteen million, two hundred twenty-nine thousand, six hundred eighty-nine".