18320953 has 12 divisors (see below), whose sum is σ = 22048740. Its totient is φ = 15160992.

The previous prime is 18320947. The next prime is 18320963. The reversal of 18320953 is 35902381.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10323369 + 7997584 = 3213^2 + 2828^2 .

It is a de Polignac number, because none of the positive numbers 2^k-18320953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18320933) 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 11 ways as a sum of consecutive naturals, for example, 5026 + ... + 7867.

It is an arithmetic number, because the mean of its divisors is an integer number (1837395).

Almost surely, 2^18320953 is an apocalyptic number.

It is an amenable number.

18320953 is a deficient number, since it is larger than the sum of its proper divisors (3727787).

18320953 is a wasteful number, since it uses less digits than its factorization.

18320953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12936 (or 12929 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 18320953 is about 4280.2982372727. The cubic root of 18320953 is about 263.6226290651.

The spelling of 18320953 in words is "eighteen million, three hundred twenty thousand, nine hundred fifty-three".