1219999 has 4 divisors (see below), whose sum is σ = 1330920. Its totient is φ = 1109080.

The previous prime is 1219991. The next prime is 1220027. The reversal of 1219999 is 9999121.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1219999 - 2³ = 1219991 is a prime.

It is a Duffinian number.

1219999 is a modest number, since divided by 9999 gives 121 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55444 + ... + 55465.

It is an arithmetic number, because the mean of its divisors is an integer number (332730).

2^1219999 is an apocalyptic number.

1219999 is a deficient number, since it is larger than the sum of its proper divisors (110921).

1219999 is a wasteful number, since it uses less digits than its factorization.

1219999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110920.

The product of its digits is 13122, while the sum is 40.

The square root of 1219999 is about 1104.5356490399. The cubic root of 1219999 is about 106.8529438201.

The spelling of 1219999 in words is "one million, two hundred nineteen thousand, nine hundred ninety-nine".