18272953 has 4 divisors (see below), whose sum is σ = 18314100. Its totient is φ = 18231808.

The previous prime is 18272951. The next prime is 18272959. The reversal of 18272953 is 35927281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4112784 + 14160169 = 2028^2 + 3763^2 .

It is a cyclic number.

It is not a de Polignac number, because 18272953 - 2¹ = 18272951 is a prime.

It is a super-2 number, since 2×18272953² = 667801622680418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18272951) 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, 19900 + ... + 20797.

It is an arithmetic number, because the mean of its divisors is an integer number (4578525).

Almost surely, 2^18272953 is an apocalyptic number.

It is an amenable number.

18272953 is a deficient number, since it is larger than the sum of its proper divisors (41147).

18272953 is an equidigital number, since it uses as much as digits as its factorization.

18272953 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41146.

The product of its digits is 30240, while the sum is 37.

The square root of 18272953 is about 4274.6874739564. The cubic root of 18272953 is about 263.3922015838.

The spelling of 18272953 in words is "eighteen million, two hundred seventy-two thousand, nine hundred fifty-three".