1213636 has 6 divisors (see below), whose sum is σ = 2123870. Its totient is φ = 606816.

The previous prime is 1213633. The next prime is 1213643. The reversal of 1213636 is 6363121.

It can be written as a sum of positive squares in only one way, i.e., 846400 + 367236 = 920^2 + 606^2 .

It is not an unprimeable number, because it can be changed into a prime (1213631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 151701 + ... + 151708.

2^1213636 is an apocalyptic number.

It is an amenable number.

1213636 is a deficient number, since it is larger than the sum of its proper divisors (910234).

1213636 is a wasteful number, since it uses less digits than its factorization.

1213636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303413 (or 303411 counting only the distinct ones).

The product of its digits is 648, while the sum is 22.

The square root of 1213636 is about 1101.6514875404. The cubic root of 1213636 is about 106.6668532983. Note that the first 3 decimals are identical.

Adding to 1213636 its reverse (6363121), we get a palindrome (7576757).

It can be divided in two parts, 1213 and 636, that added together give a square (1849 = 43²).

The spelling of 1213636 in words is "one million, two hundred thirteen thousand, six hundred thirty-six".