19809195 has 32 divisors (see below), whose sum is σ = 36675072. Its totient is φ = 8942592.

The previous prime is 19809149. The next prime is 19809203. The reversal of 19809195 is 59190891.

It is not a de Polignac number, because 19809195 - 2⁹ = 19808683 is a prime.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 7579 + ... + 9851.

It is an arithmetic number, because the mean of its divisors is an integer number (1146096).

Almost surely, 2^19809195 is an apocalyptic number.

19809195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

19809195 is a deficient number, since it is larger than the sum of its proper divisors (16865877).

19809195 is a wasteful number, since it uses less digits than its factorization.

19809195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371.

The product of its (nonzero) digits is 29160, while the sum is 42.

The square root of 19809195 is about 4450.7521836202. The cubic root of 19809195 is about 270.5757945233.

It can be divided in two parts, 1980 and 9195, that added together give a triangular number (11175 = T₁₄₉).

The spelling of 19809195 in words is "nineteen million, eight hundred nine thousand, one hundred ninety-five".