10019855 has 4 divisors (see below), whose sum is σ = 12023832. Its totient is φ = 8015880.

The previous prime is 10019839. The next prime is 10019909. The reversal of 10019855 is 55891001.

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

It is not a de Polignac number, because 10019855 - 2⁴ = 10019839 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1001981 + ... + 1001990.

It is an arithmetic number, because the mean of its divisors is an integer number (3005958).

Almost surely, 2^10019855 is an apocalyptic number.

10019855 is a deficient number, since it is larger than the sum of its proper divisors (2003977).

10019855 is an equidigital number, since it uses as much as digits as its factorization.

10019855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2003976.

The product of its (nonzero) digits is 1800, while the sum is 29.

The square root of 10019855 is about 3165.4154545652. The cubic root of 10019855 is about 215.5859624071.

The spelling of 10019855 in words is "ten million, nineteen thousand, eight hundred fifty-five".