1320219999 has 32 divisors (see below), whose sum is σ = 2237760000. Its totient is φ = 753579072.

The previous prime is 1320219947. The next prime is 1320220001. The reversal of 1320219999 is 9999120231.

It is not a de Polignac number, because 1320219999 - 2⁷ = 1320219871 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320319999) 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 31 ways as a sum of consecutive naturals, for example, 194932 + ... + 201590.

It is an arithmetic number, because the mean of its divisors is an integer number (69930000).

Almost surely, 2^1320219999 is an apocalyptic number.

1320219999 is a deficient number, since it is larger than the sum of its proper divisors (917540001).

1320219999 is a wasteful number, since it uses less digits than its factorization.

1320219999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7724 (or 7718 counting only the distinct ones).

The product of its (nonzero) digits is 78732, while the sum is 45.

The square root of 1320219999 is about 36334.8317596215. The cubic root of 1320219999 is about 1097.0222491192.

The spelling of 1320219999 in words is "one billion, three hundred twenty million, two hundred nineteen thousand, nine hundred ninety-nine".