19860055 has 4 divisors (see below), whose sum is σ = 23832072. Its totient is φ = 15888040.

The previous prime is 19860053. The next prime is 19860059. The reversal of 19860055 is 55006891.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 19860055 - 2¹ = 19860053 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19860055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19860053) 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, 1986001 + ... + 1986010.

It is an arithmetic number, because the mean of its divisors is an integer number (5958018).

Almost surely, 2^19860055 is an apocalyptic number.

19860055 is a deficient number, since it is larger than the sum of its proper divisors (3972017).

19860055 is an equidigital number, since it uses as much as digits as its factorization.

19860055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3972016.

The product of its (nonzero) digits is 10800, while the sum is 34.

The square root of 19860055 is about 4456.4621618499. The cubic root of 19860055 is about 270.8071639146.

The spelling of 19860055 in words is "nineteen million, eight hundred sixty thousand, fifty-five".