18305870 has 16 divisors (see below), whose sum is σ = 35946288. Its totient is φ = 6656640.

The previous prime is 18305869. The next prime is 18305879. The reversal of 18305870 is 7850381.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18305879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83099 + ... + 83318.

It is an arithmetic number, because the mean of its divisors is an integer number (2246643).

Almost surely, 2^18305870 is an apocalyptic number.

18305870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18305870 is a deficient number, since it is larger than the sum of its proper divisors (17640418).

18305870 is a wasteful number, since it uses less digits than its factorization.

18305870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166435.

The product of its (nonzero) digits is 6720, while the sum is 32.

The square root of 18305870 is about 4278.5359645561. The cubic root of 18305870 is about 263.5502654390.

The spelling of 18305870 in words is "eighteen million, three hundred five thousand, eight hundred seventy".