1999960187 has 2 divisors, whose sum is σ = 1999960188. Its totient is φ = 1999960186.

The previous prime is 1999960181. The next prime is 1999960241. The reversal of 1999960187 is 7810699991.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1999960187 - 2¹⁰ = 1999959163 is a prime.

It is not a weakly prime, because it can be changed into another prime (1999960181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999980093 + 999980094.

It is an arithmetic number, because the mean of its divisors is an integer number (999980094).

Almost surely, 2^1999960187 is an apocalyptic number.

1999960187 is a deficient number, since it is larger than the sum of its proper divisors (1).

1999960187 is an equidigital number, since it uses as much as digits as its factorization.

1999960187 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2204496, while the sum is 59.

The square root of 1999960187 is about 44720.9144249086. The cubic root of 1999960187 is about 1259.9126896333.

The spelling of 1999960187 in words is "one billion, nine hundred ninety-nine million, nine hundred sixty thousand, one hundred eighty-seven".