18621107 has 4 divisors (see below), whose sum is σ = 19054200. Its totient is φ = 18188016.

The previous prime is 18621091. The next prime is 18621139. The reversal of 18621107 is 70112681.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70112681 = 5059 ⋅13859.

It is a cyclic number.

It is not a de Polignac number, because 18621107 - 2⁴ = 18621091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18623107) 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 3 ways as a sum of consecutive naturals, for example, 216482 + ... + 216567.

It is an arithmetic number, because the mean of its divisors is an integer number (4763550).

Almost surely, 2^18621107 is an apocalyptic number.

18621107 is a deficient number, since it is larger than the sum of its proper divisors (433093).

18621107 is an equidigital number, since it uses as much as digits as its factorization.

18621107 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 433092.

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

The square root of 18621107 is about 4315.2180709670. The cubic root of 18621107 is about 265.0544898036.

Adding to 18621107 its reverse (70112681), we get a palindrome (88733788).

The spelling of 18621107 in words is "eighteen million, six hundred twenty-one thousand, one hundred seven".