18786945 has 16 divisors (see below), whose sum is σ = 30231360. Its totient is φ = 9962304.

The previous prime is 18786941. The next prime is 18786949. The reversal of 18786945 is 54968781.

It is an interprime number because it is at equal distance from previous prime (18786941) and next prime (18786949).

It is not a de Polignac number, because 18786945 - 2² = 18786941 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18786894 and 18786903.

It is not an unprimeable number, because it can be changed into a prime (18786941) 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 15 ways as a sum of consecutive naturals, for example, 814 + ... + 6183.

It is an arithmetic number, because the mean of its divisors is an integer number (1889460).

Almost surely, 2^18786945 is an apocalyptic number.

18786945 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18786945 is a deficient number, since it is larger than the sum of its proper divisors (11444415).

18786945 is a wasteful number, since it uses less digits than its factorization.

18786945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7184.

The product of its digits is 483840, while the sum is 48.

The square root of 18786945 is about 4334.3909606772. The cubic root of 18786945 is about 265.8390163539.

The spelling of 18786945 in words is "eighteen million, seven hundred eighty-six thousand, nine hundred forty-five".