18305429 has 4 divisors (see below), whose sum is σ = 18605580. Its totient is φ = 18005280.

The previous prime is 18305423. The next prime is 18305449. The reversal of 18305429 is 92450381.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4092529 + 14212900 = 2023^2 + 3770^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18305429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18305395 and 18305404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18305423) 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, 149984 + ... + 150105.

It is an arithmetic number, because the mean of its divisors is an integer number (4651395).

Almost surely, 2^18305429 is an apocalyptic number.

It is an amenable number.

18305429 is a deficient number, since it is larger than the sum of its proper divisors (300151).

18305429 is an equidigital number, since it uses as much as digits as its factorization.

18305429 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300150.

The product of its (nonzero) digits is 8640, while the sum is 32.

The square root of 18305429 is about 4278.4844279254. The cubic root of 18305429 is about 263.5481490578.

The spelling of 18305429 in words is "eighteen million, three hundred five thousand, four hundred twenty-nine".