1989915195 has 64 divisors (see below), whose sum is σ = 3428904960. Its totient is φ = 981915648.

The previous prime is 1989915181. The next prime is 1989915211. The reversal of 1989915195 is 5915199891.

It is not a de Polignac number, because 1989915195 - 2⁹ = 1989914683 is a prime.

It is an unprimeable number.

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 63 ways as a sum of consecutive naturals, for example, 6277177 + ... + 6277493.

It is an arithmetic number, because the mean of its divisors is an integer number (53576640).

Almost surely, 2^1989915195 is an apocalyptic number.

1989915195 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1989915195 is a deficient number, since it is larger than the sum of its proper divisors (1438989765).

1989915195 is a wasteful number, since it uses less digits than its factorization.

1989915195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 684.

The product of its digits is 1312200, while the sum is 57.

The square root of 1989915195 is about 44608.4655082418. The cubic root of 1989915195 is about 1257.7998041474.

The spelling of 1989915195 in words is "one billion, nine hundred eighty-nine million, nine hundred fifteen thousand, one hundred ninety-five".