1289636 has 6 divisors (see below), whose sum is σ = 2256870. Its totient is φ = 644816.

The previous prime is 1289627. The next prime is 1289653. The reversal of 1289636 is 6369821.

It can be written as a sum of positive squares in only one way, i.e., 649636 + 640000 = 806^2 + 800^2 .

It is a super-2 number, since 2×1289636² = 3326322024992, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1289596 and 1289605.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 161201 + ... + 161208.

It is an arithmetic number, because the mean of its divisors is an integer number (376145).

2^1289636 is an apocalyptic number.

It is an amenable number.

1289636 is a deficient number, since it is larger than the sum of its proper divisors (967234).

1289636 is a wasteful number, since it uses less digits than its factorization.

1289636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322413 (or 322411 counting only the distinct ones).

The product of its digits is 15552, while the sum is 35.

The square root of 1289636 is about 1135.6214157896. The cubic root of 1289636 is about 108.8484834738.

The spelling of 1289636 in words is "one million, two hundred eighty-nine thousand, six hundred thirty-six".