1208821 has 2 divisors, whose sum is σ = 1208822. Its totient is φ = 1208820.

The previous prime is 1208813. The next prime is 1208833. The reversal of 1208821 is 1288021.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1028196 + 180625 = 1014^2 + 425^2 .

It is a cyclic number.

It is not a de Polignac number, because 1208821 - 2³ = 1208813 is a prime.

It is a super-2 number, since 2×1208821² = 2922496420082, which contains 22 as substring.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 1208792 and 1208801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1208021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 604410 + 604411.

It is an arithmetic number, because the mean of its divisors is an integer number (604411).

2^1208821 is an apocalyptic number.

It is an amenable number.

1208821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1208821 is an equidigital number, since it uses as much as digits as its factorization.

1208821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 256, while the sum is 22.

The square root of 1208821 is about 1099.4639603007. The cubic root of 1208821 is about 106.5256023733.

The spelling of 1208821 in words is "one million, two hundred eight thousand, eight hundred twenty-one".