19840385 has 4 divisors (see below), whose sum is σ = 23808468. Its totient is φ = 15872304.

The previous prime is 19840369. The next prime is 19840397. The reversal of 19840385 is 58304891.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10452289 + 9388096 = 3233^2 + 3064^2 .

It is a cyclic number.

It is not a de Polignac number, because 19840385 - 2⁴ = 19840369 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1984034 + ... + 1984043.

It is an arithmetic number, because the mean of its divisors is an integer number (5952117).

Almost surely, 2^19840385 is an apocalyptic number.

It is an amenable number.

19840385 is a deficient number, since it is larger than the sum of its proper divisors (3968083).

19840385 is an equidigital number, since it uses as much as digits as its factorization.

19840385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968082.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 19840385 is about 4454.2547075802. The cubic root of 19840385 is about 270.7177291760.

The spelling of 19840385 in words is "nineteen million, eight hundred forty thousand, three hundred eighty-five".