1121999140 has 12 divisors (see below), whose sum is σ = 2356198236. Its totient is φ = 448799648.

The previous prime is 1121999117. The next prime is 1121999141. The reversal of 1121999140 is 419991211.

It can be written as a sum of positive squares in 2 ways, for example, as 821739556 + 300259584 = 28666^2 + 17328^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1121999140.

It is not an unprimeable number, because it can be changed into a prime (1121999141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28049959 + ... + 28049998.

It is an arithmetic number, because the mean of its divisors is an integer number (196349853).

Almost surely, 2^1121999140 is an apocalyptic number.

1121999140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121999140 is an abundant number, since it is smaller than the sum of its proper divisors (1234199096).

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

1121999140 is a wasteful number, since it uses less digits than its factorization.

1121999140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56099966 (or 56099964 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 37.

The square root of 1121999140 is about 33496.2556116352. The cubic root of 1121999140 is about 1039.1163413554.

The spelling of 1121999140 in words is "one billion, one hundred twenty-one million, nine hundred ninety-nine thousand, one hundred forty".