1422821 has 2 divisors, whose sum is σ = 1422822. Its totient is φ = 1422820.

The previous prime is 1422797. The next prime is 1422833. The reversal of 1422821 is 1282241.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 829921 + 592900 = 911^2 + 770^2 .

It is an emirp because it is prime and its reverse (1282241) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1422821 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 1422793 and 1422802.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1422221) 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 as a sum of consecutive naturals, namely, 711410 + 711411.

It is an arithmetic number, because the mean of its divisors is an integer number (711411).

2^1422821 is an apocalyptic number.

It is an amenable number.

1422821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1422821 is an equidigital number, since it uses as much as digits as its factorization.

1422821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 256, while the sum is 20.

The square root of 1422821 is about 1192.8206067972. The cubic root of 1422821 is about 112.4734686406.

The spelling of 1422821 in words is "one million, four hundred twenty-two thousand, eight hundred twenty-one".