1216623 has 4 divisors (see below), whose sum is σ = 1622168. Its totient is φ = 811080.

The previous prime is 1216619. The next prime is 1216681. The reversal of 1216623 is 3266121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3266121 = 3 ⋅1088707.

It is not a de Polignac number, because 1216623 - 2² = 1216619 is a prime.

It is a D-number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1216623.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202768 + ... + 202773.

It is an arithmetic number, because the mean of its divisors is an integer number (405542).

2^1216623 is an apocalyptic number.

1216623 is a deficient number, since it is larger than the sum of its proper divisors (405545).

1216623 is an equidigital number, since it uses as much as digits as its factorization.

1216623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405544.

The product of its digits is 432, while the sum is 21.

The square root of 1216623 is about 1103.0063463099. The cubic root of 1216623 is about 106.7542910629.

The spelling of 1216623 in words is "one million, two hundred sixteen thousand, six hundred twenty-three".