19985359 has 8 divisors (see below), whose sum is σ = 21716480. Its totient is φ = 18322200.

The previous prime is 19985351. The next prime is 19985401. The reversal of 19985359 is 95358991.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 19985359 - 2³ = 19985351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19985351) 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, 16377 + ... + 17554.

It is an arithmetic number, because the mean of its divisors is an integer number (2714560).

Almost surely, 2^19985359 is an apocalyptic number.

19985359 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

19985359 is a deficient number, since it is larger than the sum of its proper divisors (1731121).

19985359 is a wasteful number, since it uses less digits than its factorization.

19985359 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33981.

The product of its digits is 437400, while the sum is 49.

The square root of 19985359 is about 4470.4987417513. The cubic root of 19985359 is about 271.3755091763.

It can be divided in two parts, 199 and 85359, that added together give a palindrome (85558).

The spelling of 19985359 in words is "nineteen million, nine hundred eighty-five thousand, three hundred fifty-nine".