19872855 has 12 divisors (see below), whose sum is σ = 34446360. Its totient is φ = 10598832.

The previous prime is 19872821. The next prime is 19872857. The reversal of 19872855 is 55827891.

It is a happy number.

It is not a de Polignac number, because 19872855 - 2⁶ = 19872791 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 441619 = 19872855 / (1 + 9 + 8 + 7 + 2 + 8 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 19872855.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19872857) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 220765 + ... + 220854.

It is an arithmetic number, because the mean of its divisors is an integer number (2870530).

Almost surely, 2^19872855 is an apocalyptic number.

19872855 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19872855 is a deficient number, since it is larger than the sum of its proper divisors (14573505).

19872855 is a wasteful number, since it uses less digits than its factorization.

19872855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441630 (or 441627 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 19872855 is about 4457.8980472864. The cubic root of 19872855 is about 270.8653307100.

The spelling of 19872855 in words is "nineteen million, eight hundred seventy-two thousand, eight hundred fifty-five".