18107621 has 8 divisors (see below), whose sum is σ = 21003840. Its totient is φ = 15288768.

The previous prime is 18107611. The next prime is 18107623. The reversal of 18107621 is 12670181.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18107621 - 2¹⁰ = 18106597 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18107623) 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 in 7 ways as a sum of consecutive naturals, for example, 18836 + ... + 19773.

It is an arithmetic number, because the mean of its divisors is an integer number (2625480).

Almost surely, 2^18107621 is an apocalyptic number.

It is an amenable number.

18107621 is a deficient number, since it is larger than the sum of its proper divisors (2896219).

18107621 is an equidigital number, since it uses as much as digits as its factorization.

18107621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38683.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 18107621 is about 4255.3050419447. The cubic root of 18107621 is about 262.5954108195.

The spelling of 18107621 in words is "eighteen million, one hundred seven thousand, six hundred twenty-one".