1199199920 has 20 divisors (see below), whose sum is σ = 2788140000. Its totient is φ = 479679936.

The previous prime is 1199199919. The next prime is 1199199923. The reversal of 1199199920 is 299919911.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (1199199923) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7494920 + ... + 7495079.

It is an arithmetic number, because the mean of its divisors is an integer number (139407000).

Almost surely, 2^1199199920 is an apocalyptic number.

1199199920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1199199920 is an abundant number, since it is smaller than the sum of its proper divisors (1588940080).

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

1199199920 is a wasteful number, since it uses less digits than its factorization.

1199199920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14990012 (or 14990006 counting only the distinct ones).

The product of its (nonzero) digits is 118098, while the sum is 50.

The square root of 1199199920 is about 34629.4660657654. The cubic root of 1199199920 is about 1062.4223467124.

The spelling of 1199199920 in words is "one billion, one hundred ninety-nine million, one hundred ninety-nine thousand, nine hundred twenty".