1216562 has 16 divisors (see below), whose sum is σ = 1944000. Its totient is φ = 569712.

The previous prime is 1216561. The next prime is 1216577. The reversal of 1216562 is 2656121.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (1216561) 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 in 7 ways as a sum of consecutive naturals, for example, 2189 + ... + 2687.

It is an arithmetic number, because the mean of its divisors is an integer number (121500).

2^1216562 is an apocalyptic number.

1216562 is a deficient number, since it is larger than the sum of its proper divisors (727438).

1216562 is a wasteful number, since it uses less digits than its factorization.

1216562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577.

The product of its digits is 720, while the sum is 23.

The square root of 1216562 is about 1102.9786942639. The cubic root of 1216562 is about 106.7525068563.

The spelling of 1216562 in words is "one million, two hundred sixteen thousand, five hundred sixty-two".