1199999999 has 12 divisors (see below), whose sum is σ = 1368489192. Its totient is φ = 1043473200.

The previous prime is 1199999993. The next prime is 1200000041. The reversal of 1199999999 is 9999999911.

It is not a de Polignac number, because 1199999999 - 2²⁴ = 1183222783 is a prime.

It is a Duffinian number.

1199999999 is a modest number, since divided by 99999 gives 11999 as remainder.

It is a plaindrome in base 10.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1199999993) 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 11 ways as a sum of consecutive naturals, for example, 97292 + ... + 108929.

It is an arithmetic number, because the mean of its divisors is an integer number (114040766).

Almost surely, 2^1199999999 is an apocalyptic number.

1199999999 is a deficient number, since it is larger than the sum of its proper divisors (168489193).

1199999999 is a wasteful number, since it uses less digits than its factorization.

1199999999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206278 (or 206255 counting only the distinct ones).

The product of its digits is 43046721, while the sum is 74.

The square root of 1199999999 is about 34641.0161369438. The cubic root of 1199999999 is about 1062.6585688874.

The spelling of 1199999999 in words is "one billion, one hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred ninety-nine".