19216085 has 24 divisors (see below), whose sum is σ = 27492696. Its totient is φ = 12848640.

The previous prime is 19216081. The next prime is 19216097. The reversal of 19216085 is 58061291.

It can be written as a sum of positive squares in 4 ways, for example, as 1162084 + 18054001 = 1078^2 + 4249^2 .

It is not a de Polignac number, because 19216085 - 2² = 19216081 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19216081) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 9089 + ... + 11001.

It is an arithmetic number, because the mean of its divisors is an integer number (1145529).

Almost surely, 2^19216085 is an apocalyptic number.

It is an amenable number.

19216085 is a deficient number, since it is larger than the sum of its proper divisors (8276611).

19216085 is a wasteful number, since it uses less digits than its factorization.

19216085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1973 (or 1966 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 19216085 is about 4383.6155168993. The cubic root of 19216085 is about 267.8479357513.

The spelling of 19216085 in words is "nineteen million, two hundred sixteen thousand, eighty-five".