1289986 has 16 divisors (see below), whose sum is σ = 2066400. Its totient is φ = 602208.

The previous prime is 1289971. The next prime is 1290013. The reversal of 1289986 is 6899821.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2950 + ... + 3358.

It is an arithmetic number, because the mean of its divisors is an integer number (129150).

2^1289986 is an apocalyptic number.

1289986 is a deficient number, since it is larger than the sum of its proper divisors (776414).

1289986 is a wasteful number, since it uses less digits than its factorization.

1289986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513.

The product of its digits is 62208, while the sum is 43.

The square root of 1289986 is about 1135.7755059870. The cubic root of 1289986 is about 108.8583295397.

It can be divided in two parts, 12 and 89986, that added together give a palindrome (89998).

The spelling of 1289986 in words is "one million, two hundred eighty-nine thousand, nine hundred eighty-six".