19985253 has 4 divisors (see below), whose sum is σ = 26647008. Its totient is φ = 13323500.

The previous prime is 19985243. The next prime is 19985261. The reversal of 19985253 is 35258991.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 35258991 = 3 ⋅11752997.

It is a cyclic number.

It is not a de Polignac number, because 19985253 - 2¹⁰ = 19984229 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 (19985243) 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 3 ways as a sum of consecutive naturals, for example, 3330873 + ... + 3330878.

It is an arithmetic number, because the mean of its divisors is an integer number (6661752).

Almost surely, 2^19985253 is an apocalyptic number.

It is an amenable number.

19985253 is a deficient number, since it is larger than the sum of its proper divisors (6661755).

19985253 is an equidigital number, since it uses as much as digits as its factorization.

19985253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6661754.

The product of its digits is 97200, while the sum is 42.

The square root of 19985253 is about 4470.4868862351. The cubic root of 19985253 is about 271.3750293941.

The spelling of 19985253 in words is "nineteen million, nine hundred eighty-five thousand, two hundred fifty-three".