1999140198 has 32 divisors (see below), whose sum is σ = 4363759872. Its totient is φ = 605522400.

The previous prime is 1999140191. The next prime is 1999140203. The reversal of 1999140198 is 8910419991.

It is a self number, because there is not a number n which added to its sum of digits gives 1999140198.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999140191) 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 15 ways as a sum of consecutive naturals, for example, 173340 + ... + 184512.

It is an arithmetic number, because the mean of its divisors is an integer number (136367496).

Almost surely, 2^1999140198 is an apocalyptic number.

1999140198 is an abundant number, since it is smaller than the sum of its proper divisors (2364619674).

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

1999140198 is a wasteful number, since it uses less digits than its factorization.

1999140198 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13900.

The product of its (nonzero) digits is 209952, while the sum is 51.

The square root of 1999140198 is about 44711.7456380312. The cubic root of 1999140198 is about 1259.7404769098.

The spelling of 1999140198 in words is "one billion, nine hundred ninety-nine million, one hundred forty thousand, one hundred ninety-eight".