18234689 has 4 divisors (see below), whose sum is σ = 19892400. Its totient is φ = 16576980.

The previous prime is 18234631. The next prime is 18234691. The reversal of 18234689 is 98643281.

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, and also an emirpimes, since its reverse is a distinct semiprime: 98643281 = 11 ⋅8967571.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18234689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18234089) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 828839 + ... + 828860.

It is an arithmetic number, because the mean of its divisors is an integer number (4973100).

Almost surely, 2^18234689 is an apocalyptic number.

It is an amenable number.

18234689 is a deficient number, since it is larger than the sum of its proper divisors (1657711).

18234689 is a wasteful number, since it uses less digits than its factorization.

18234689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1657710.

The product of its digits is 82944, while the sum is 41.

The square root of 18234689 is about 4270.2094796391. The cubic root of 18234689 is about 263.2082232520.

The spelling of 18234689 in words is "eighteen million, two hundred thirty-four thousand, six hundred eighty-nine".