18168953 has 4 divisors (see below), whose sum is σ = 19820688. Its totient is φ = 16517220.

The previous prime is 18168929. The next prime is 18168967. The reversal of 18168953 is 35986181.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 18168953 - 2⁶ = 18168889 is a prime.

It is a super-2 number, since 2×18168953² = 660221706232418, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18168953.

It is not an unprimeable number, because it can be changed into a prime (18168923) 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 3 ways as a sum of consecutive naturals, for example, 825851 + ... + 825872.

It is an arithmetic number, because the mean of its divisors is an integer number (4955172).

Almost surely, 2^18168953 is an apocalyptic number.

It is an amenable number.

18168953 is a deficient number, since it is larger than the sum of its proper divisors (1651735).

18168953 is a wasteful number, since it uses less digits than its factorization.

18168953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1651734.

The product of its digits is 51840, while the sum is 41.

The square root of 18168953 is about 4262.5054838674. The cubic root of 18168953 is about 262.8915541270.

The spelling of 18168953 in words is "eighteen million, one hundred sixty-eight thousand, nine hundred fifty-three".