18671144 has 8 divisors (see below), whose sum is σ = 35008410. Its totient is φ = 9335568.

The previous prime is 18671141. The next prime is 18671153. The reversal of 18671144 is 44117681.

It can be written as a sum of positive squares in only one way, i.e., 18232900 + 438244 = 4270^2 + 662^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×18671144² = 697223236537472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 18671144.

It is not an unprimeable number, because it can be changed into a prime (18671141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1166939 + ... + 1166954.

Almost surely, 2^18671144 is an apocalyptic number.

It is an amenable number.

18671144 is a deficient number, since it is larger than the sum of its proper divisors (16337266).

18671144 is a wasteful number, since it uses less digits than its factorization.

18671144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333899 (or 2333895 counting only the distinct ones).

The product of its digits is 5376, while the sum is 32.

The square root of 18671144 is about 4321.0119185209. The cubic root of 18671144 is about 265.2916878375.

The spelling of 18671144 in words is "eighteen million, six hundred seventy-one thousand, one hundred forty-four".