1216825 has 6 divisors (see below), whose sum is σ = 1508894. Its totient is φ = 973440.

The previous prime is 1216823. The next prime is 1216841. The reversal of 1216825 is 5286121.

It can be written as a sum of positive squares in 3 ways, for example, as 4624 + 1212201 = 68^2 + 1101^2 .

It is not a de Polignac number, because 1216825 - 2¹ = 1216823 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (25), and also a Moran number because the ratio is a prime number: 48673 = 1216825 / (1 + 2 + 1 + 6 + 8 + 2 + 5).

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 1216825.

It is not an unprimeable number, because it can be changed into a prime (1216823) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 24312 + ... + 24361.

2^1216825 is an apocalyptic number.

It is an amenable number.

1216825 is a deficient number, since it is larger than the sum of its proper divisors (292069).

1216825 is an equidigital number, since it uses as much as digits as its factorization.

1216825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48683 (or 48678 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 1216825 is about 1103.0979104323. The cubic root of 1216825 is about 106.7601989937.

The spelling of 1216825 in words is "one million, two hundred sixteen thousand, eight hundred twenty-five".