1216355 has 16 divisors (see below), whose sum is σ = 1741824. Its totient is φ = 797280.

The previous prime is 1216351. The next prime is 1216373. The reversal of 1216355 is 5536121.

It is not a de Polignac number, because 1216355 - 2² = 1216351 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 1216355.

It is not an unprimeable number, because it can be changed into a prime (1216351) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 50 + ... + 1560.

It is an arithmetic number, because the mean of its divisors is an integer number (108864).

2^1216355 is an apocalyptic number.

1216355 is a deficient number, since it is larger than the sum of its proper divisors (525469).

1216355 is a wasteful number, since it uses less digits than its factorization.

1216355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546.

The product of its digits is 900, while the sum is 23.

The square root of 1216355 is about 1102.8848534639. The cubic root of 1216355 is about 106.7464518087.

The spelling of 1216355 in words is "one million, two hundred sixteen thousand, three hundred fifty-five".