18667481 has 12 divisors (see below), whose sum is σ = 22859280. Its totient is φ = 15157800.

The previous prime is 18667471. The next prime is 18667489. The reversal of 18667481 is 18476681.

It is not a de Polignac number, because 18667481 - 2⁶ = 18667417 is a prime.

It is a super-2 number, since 2×18667481² = 696949693770722, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (18667489) 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, 9095 + ... + 10956.

It is an arithmetic number, because the mean of its divisors is an integer number (1904940).

Almost surely, 2^18667481 is an apocalyptic number.

It is an amenable number.

18667481 is a deficient number, since it is larger than the sum of its proper divisors (4191799).

18667481 is a wasteful number, since it uses less digits than its factorization.

18667481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20084 (or 20077 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 18667481 is about 4320.5880386818. The cubic root of 18667481 is about 265.2743379452.

The spelling of 18667481 in words is "eighteen million, six hundred sixty-seven thousand, four hundred eighty-one".