19885243 has 8 divisors (see below), whose sum is σ = 23340512. Its totient is φ = 16583616.

The previous prime is 19885241. The next prime is 19885247. The reversal of 19885243 is 34258891.

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

It is not a de Polignac number, because 19885243 - 2¹ = 19885241 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19885196 and 19885205.

It is not an unprimeable number, because it can be changed into a prime (19885241) 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, 38130 + ... + 38647.

It is an arithmetic number, because the mean of its divisors is an integer number (2917564).

Almost surely, 2^19885243 is an apocalyptic number.

19885243 is a deficient number, since it is larger than the sum of its proper divisors (3455269).

19885243 is an equidigital number, since it uses as much as digits as its factorization.

19885243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76821.

The product of its digits is 69120, while the sum is 40.

The square root of 19885243 is about 4459.2872748905. The cubic root of 19885243 is about 270.9216014829.

The spelling of 19885243 in words is "nineteen million, eight hundred eighty-five thousand, two hundred forty-three".