19878285 has 48 divisors (see below), whose sum is σ = 37749888. Its totient is φ = 8749440.

The previous prime is 19878283. The next prime is 19878301. The reversal of 19878285 is 58287891.

It is not a de Polignac number, because 19878285 - 2¹ = 19878283 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 (19878283) 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 47 ways as a sum of consecutive naturals, for example, 100807 + ... + 101003.

It is an arithmetic number, because the mean of its divisors is an integer number (786456).

Almost surely, 2^19878285 is an apocalyptic number.

19878285 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

19878285 is a deficient number, since it is larger than the sum of its proper divisors (17871603).

19878285 is a wasteful number, since it uses less digits than its factorization.

19878285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 274 (or 243 counting only the distinct ones).

The product of its digits is 322560, while the sum is 48.

The square root of 19878285 is about 4458.5070371146. The cubic root of 19878285 is about 270.8899986101.

The spelling of 19878285 in words is "nineteen million, eight hundred seventy-eight thousand, two hundred eighty-five".