19985239 has 4 divisors (see below), whose sum is σ = 20450056. Its totient is φ = 19520424.

The previous prime is 19985227. The next prime is 19985243. The reversal of 19985239 is 93258991.

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

It is a cyclic number.

It is not a de Polignac number, because 19985239 - 2¹¹ = 19983191 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 (19985209) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 232344 + ... + 232429.

It is an arithmetic number, because the mean of its divisors is an integer number (5112514).

Almost surely, 2^19985239 is an apocalyptic number.

19985239 is a deficient number, since it is larger than the sum of its proper divisors (464817).

19985239 is an equidigital number, since it uses as much as digits as its factorization.

19985239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464816.

The product of its digits is 174960, while the sum is 46.

The square root of 19985239 is about 4470.4853204099. The cubic root of 19985239 is about 271.3749660266.

The spelling of 19985239 in words is "nineteen million, nine hundred eighty-five thousand, two hundred thirty-nine".