18821085 has 8 divisors (see below), whose sum is σ = 30113760. Its totient is φ = 10037904.

The previous prime is 18821083. The next prime is 18821111. The reversal of 18821085 is 58012881.

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

It is not a de Polignac number, because 18821085 - 2¹ = 18821083 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18821083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 627355 + ... + 627384.

It is an arithmetic number, because the mean of its divisors is an integer number (3764220).

Almost surely, 2^18821085 is an apocalyptic number.

18821085 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18821085 is a deficient number, since it is larger than the sum of its proper divisors (11292675).

18821085 is a wasteful number, since it uses less digits than its factorization.

18821085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1254747.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 18821085 is about 4338.3274426903. The cubic root of 18821085 is about 265.9999481787. Note that the first 4 decimals are identical.

The spelling of 18821085 in words is "eighteen million, eight hundred twenty-one thousand, eighty-five".