19878252 has 12 divisors (see below), whose sum is σ = 46382616. Its totient is φ = 6626080.

The previous prime is 19878247. The next prime is 19878259. The reversal of 19878252 is 25287891.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (19878259) 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, 828249 + ... + 828272.

It is an arithmetic number, because the mean of its divisors is an integer number (3865218).

Almost surely, 2^19878252 is an apocalyptic number.

19878252 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19878252 is an abundant number, since it is smaller than the sum of its proper divisors (26504364).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19878252 is a wasteful number, since it uses less digits than its factorization.

19878252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656528 (or 1656526 counting only the distinct ones).

The product of its digits is 80640, while the sum is 42.

The square root of 19878252 is about 4458.5033363226. The cubic root of 19878252 is about 270.8898487083.

The spelling of 19878252 in words is "nineteen million, eight hundred seventy-eight thousand, two hundred fifty-two".