18308953 has 12 divisors (see below), whose sum is σ = 20001168. Its totient is φ = 16751280.

The previous prime is 18308929. The next prime is 18308959. The reversal of 18308953 is 35980381.

It is not a de Polignac number, because 18308953 - 2⁵ = 18308921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18308959) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21726 + ... + 22552.

It is an arithmetic number, because the mean of its divisors is an integer number (1666764).

Almost surely, 2^18308953 is an apocalyptic number.

18308953 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

18308953 is a deficient number, since it is larger than the sum of its proper divisors (1692215).

18308953 is a wasteful number, since it uses less digits than its factorization.

18308953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984 (or 971 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 18308953 is about 4278.8962361805. The cubic root of 18308953 is about 263.5650599623.

The spelling of 18308953 in words is "eighteen million, three hundred eight thousand, nine hundred fifty-three".