19281985 has 8 divisors (see below), whose sum is σ = 23630976. Its totient is φ = 15097200.

The previous prime is 19281959. The next prime is 19281989. The reversal of 19281985 is 58918291.

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

It is not a de Polignac number, because 19281985 - 2⁵ = 19281953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19281989) 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, 40791 + ... + 41260.

It is an arithmetic number, because the mean of its divisors is an integer number (2953872).

Almost surely, 2^19281985 is an apocalyptic number.

It is an amenable number.

19281985 is a deficient number, since it is larger than the sum of its proper divisors (4348991).

19281985 is an equidigital number, since it uses as much as digits as its factorization.

19281985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82103.

The product of its digits is 51840, while the sum is 43.

The square root of 19281985 is about 4391.1257098835. The cubic root of 19281985 is about 268.1537739689.

The spelling of 19281985 in words is "nineteen million, two hundred eighty-one thousand, nine hundred eighty-five".