1216534 has 16 divisors (see below), whose sum is σ = 2011536. Its totient is φ = 551760.

The previous prime is 1216529. The next prime is 1216543. The reversal of 1216534 is 4356121.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is a nialpdrome in base 11.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 2434 + ... + 2890.

It is an arithmetic number, because the mean of its divisors is an integer number (125721).

2^1216534 is an apocalyptic number.

1216534 is a deficient number, since it is larger than the sum of its proper divisors (795002).

1216534 is an equidigital number, since it uses as much as digits as its factorization.

1216534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 492 (or 470 counting only the distinct ones).

The product of its digits is 720, while the sum is 22.

The square root of 1216534 is about 1102.9660012893. The cubic root of 1216534 is about 106.7516878562.

The spelling of 1216534 in words is "one million, two hundred sixteen thousand, five hundred thirty-four".