18918845 has 16 divisors (see below), whose sum is σ = 25176960. Its totient is φ = 13531200.

The previous prime is 18918829. The next prime is 18918859. The reversal of 18918845 is 54881981.

It is not a de Polignac number, because 18918845 - 2⁴ = 18918829 is a prime.

It is a super-2 number, since 2×18918845² = 715845392268050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18918796 and 18918805.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 536 + ... + 6174.

It is an arithmetic number, because the mean of its divisors is an integer number (1573560).

Almost surely, 2^18918845 is an apocalyptic number.

It is an amenable number.

18918845 is a deficient number, since it is larger than the sum of its proper divisors (6258115).

18918845 is a wasteful number, since it uses less digits than its factorization.

18918845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5716.

The product of its digits is 92160, while the sum is 44.

The square root of 18918845 is about 4349.5798647686. The cubic root of 18918845 is about 266.4597031297.

The spelling of 18918845 in words is "eighteen million, nine hundred eighteen thousand, eight hundred forty-five".