1999870308 has 36 divisors (see below), whose sum is σ = 5321294160. Its totient is φ = 631537776.

The previous prime is 1999870303. The next prime is 1999870319. The reversal of 1999870308 is 8030789991.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (1999870303) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1461210 + ... + 1462577.

Almost surely, 2^1999870308 is an apocalyptic number.

1999870308 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1999870308 is an abundant number, since it is smaller than the sum of its proper divisors (3321423852).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1999870308 is a wasteful number, since it uses less digits than its factorization.

1999870308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2923816 (or 2923811 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 1999870308 is about 44719.9095258477. The cubic root of 1999870308 is about 1259.8938156927.

The spelling of 1999870308 in words is "one billion, nine hundred ninety-nine million, eight hundred seventy thousand, three hundred eight".