1219989 has 8 divisors (see below), whose sum is σ = 1697472. Its totient is φ = 777920.

The previous prime is 1219963. The next prime is 1219991. The reversal of 1219989 is 9899121.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1219989 - 2⁵ = 1219957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1219909) 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 7 ways as a sum of consecutive naturals, for example, 8772 + ... + 8909.

It is an arithmetic number, because the mean of its divisors is an integer number (212184).

2^1219989 is an apocalyptic number.

It is an amenable number.

1219989 is a deficient number, since it is larger than the sum of its proper divisors (477483).

1219989 is a wasteful number, since it uses less digits than its factorization.

1219989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17707.

The product of its digits is 11664, while the sum is 39.

The square root of 1219989 is about 1104.5311222415. The cubic root of 1219989 is about 106.8526518711.

The spelling of 1219989 in words is "one million, two hundred nineteen thousand, nine hundred eighty-nine".