1213616 has 20 divisors (see below), whose sum is σ = 2377824. Its totient is φ = 600000.

The previous prime is 1213607. The next prime is 1213627. The reversal of 1213616 is 6163121.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 1241 + ... + 1991.

2^1213616 is an apocalyptic number.

1213616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

1213616 is a deficient number, since it is larger than the sum of its proper divisors (1164208).

1213616 is a wasteful number, since it uses less digits than its factorization.

1213616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860 (or 854 counting only the distinct ones).

The product of its digits is 216, while the sum is 20.

The square root of 1213616 is about 1101.6424102221. The cubic root of 1213616 is about 106.6662673596. Note that the first 3 decimals are identical.

Adding to 1213616 its reverse (6163121), we get a palindrome (7376737).

The spelling of 1213616 in words is "one million, two hundred thirteen thousand, six hundred sixteen".