18428345 has 16 divisors (see below), whose sum is σ = 23904720. Its totient is φ = 13557504.

The previous prime is 18428341. The next prime is 18428413. The reversal of 18428345 is 54382481.

It can be written as a sum of positive squares in 8 ways, for example, as 2042041 + 16386304 = 1429^2 + 4048^2 .

It is a cyclic number.

It is not a de Polignac number, because 18428345 - 2² = 18428341 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18428341) 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, 32807 + ... + 33363.

It is an arithmetic number, because the mean of its divisors is an integer number (1494045).

Almost surely, 2^18428345 is an apocalyptic number.

It is an amenable number.

18428345 is a deficient number, since it is larger than the sum of its proper divisors (5476375).

18428345 is a wasteful number, since it uses less digits than its factorization.

18428345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1084.

The product of its digits is 30720, while the sum is 35.

The square root of 18428345 is about 4292.8248275465. The cubic root of 18428345 is about 264.1367184794.

The spelling of 18428345 in words is "eighteen million, four hundred twenty-eight thousand, three hundred forty-five".