19219985 has 8 divisors (see below), whose sum is σ = 23090280. Its totient is φ = 15358464.

The previous prime is 19219943. The next prime is 19219987. The reversal of 19219985 is 58991291.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 824464 + 18395521 = 908^2 + 4289^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19219985 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19219987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4481 + ... + 7649.

It is an arithmetic number, because the mean of its divisors is an integer number (2886285).

Almost surely, 2^19219985 is an apocalyptic number.

It is an amenable number.

19219985 is a deficient number, since it is larger than the sum of its proper divisors (3870295).

19219985 is a wasteful number, since it uses less digits than its factorization.

19219985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4387.

The product of its digits is 58320, while the sum is 44.

The square root of 19219985 is about 4384.0603326140. The cubic root of 19219985 is about 267.8660548823.

The spelling of 19219985 in words is "nineteen million, two hundred nineteen thousand, nine hundred eighty-five".