1219789992 has 16 divisors (see below), whose sum is σ = 3049475040. Its totient is φ = 406596656.

The previous prime is 1219789973. The next prime is 1219789993. The reversal of 1219789992 is 2999879121.

It is not an unprimeable number, because it can be changed into a prime (1219789993) 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, 25412268 + ... + 25412315.

It is an arithmetic number, because the mean of its divisors is an integer number (190592190).

Almost surely, 2^1219789992 is an apocalyptic number.

1219789992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1219789992 is an abundant number, since it is smaller than the sum of its proper divisors (1829685048).

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

1219789992 is a wasteful number, since it uses less digits than its factorization.

1219789992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50824592 (or 50824588 counting only the distinct ones).

The product of its digits is 1469664, while the sum is 57.

The square root of 1219789992 is about 34925.4920079875. The cubic root of 1219789992 is about 1068.4684152121.

The spelling of 1219789992 in words is "one billion, two hundred nineteen million, seven hundred eighty-nine thousand, nine hundred ninety-two".