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1216223 = 3139233
BaseRepresentation
bin100101000111011011111
32021210100022
410220323133
5302404343
642022355
713223561
oct4507337
92253308
101216223
11760848
124a79bb
13337778
14239331
15190568
hex128edf

1216223 has 4 divisors (see below), whose sum is σ = 1255488. Its totient is φ = 1176960.

The previous prime is 1216213. The next prime is 1216249. The reversal of 1216223 is 3226121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3226121 = 25712553.

It is a cyclic number.

It is not a de Polignac number, because 1216223 - 214 = 1199839 is a prime.

It is a Duffinian number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19586 + ... + 19647.

It is an arithmetic number, because the mean of its divisors is an integer number (313872).

21216223 is an apocalyptic number.

1216223 is a deficient number, since it is larger than the sum of its proper divisors (39265).

1216223 is an equidigital number, since it uses as much as digits as its factorization.

1216223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39264.

The product of its digits is 144, while the sum is 17.

The square root of 1216223 is about 1102.8250087843. The cubic root of 1216223 is about 106.7425902602.

The spelling of 1216223 in words is "one million, two hundred sixteen thousand, two hundred twenty-three".

Divisors: 1 31 39233 1216223