19871055 has 64 divisors (see below), whose sum is σ = 38092800. Its totient is φ = 9797760.

The previous prime is 19871053. The next prime is 19871063. The reversal of 19871055 is 55017891.

It is not a de Polignac number, because 19871055 - 2¹ = 19871053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19871051) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 156402 + ... + 156528.

It is an arithmetic number, because the mean of its divisors is an integer number (595200).

Almost surely, 2^19871055 is an apocalyptic number.

19871055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19871055 is a deficient number, since it is larger than the sum of its proper divisors (18221745).

19871055 is a wasteful number, since it uses less digits than its factorization.

19871055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221 (or 215 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 19871055 is about 4457.6961538445. The cubic root of 19871055 is about 270.8571525139.

It can be divided in two parts, 198710 and 55, that added together give a triangular number (198765 = T₆₃₀).

The spelling of 19871055 in words is "nineteen million, eight hundred seventy-one thousand, fifty-five".