1999642095 has 24 divisors (see below), whose sum is σ = 3781142352. Its totient is φ = 969523200.

The previous prime is 1999642093. The next prime is 1999642111. The reversal of 1999642095 is 5902469991.

It is not a de Polignac number, because 1999642095 - 2¹ = 1999642093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999642093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2019346 + ... + 2020335.

It is an arithmetic number, because the mean of its divisors is an integer number (157547598).

Almost surely, 2^1999642095 is an apocalyptic number.

1999642095 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1999642095 is a deficient number, since it is larger than the sum of its proper divisors (1781500257).

1999642095 is a wasteful number, since it uses less digits than its factorization.

1999642095 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4039703 (or 4039700 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 54.

The square root of 1999642095 is about 44717.3578714128. The cubic root of 1999642095 is about 1259.8458900708.

The spelling of 1999642095 in words is "one billion, nine hundred ninety-nine million, six hundred forty-two thousand, ninety-five".