1047821 has 2 divisors, whose sum is σ = 1047822. Its totient is φ = 1047820.

The previous prime is 1047779. The next prime is 1047833. The reversal of 1047821 is 1287401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 972196 + 75625 = 986^2 + 275^2 .

It is an emirp because it is prime and its reverse (1287401) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1047821 - 2¹⁰ = 1046797 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1047841) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 523910 + 523911.

It is an arithmetic number, because the mean of its divisors is an integer number (523911).

2^1047821 is an apocalyptic number.

It is an amenable number.

1047821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1047821 is an equidigital number, since it uses as much as digits as its factorization.

1047821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1047821 is about 1023.6312812727. The cubic root of 1047821 is about 101.5692781748.

The spelling of 1047821 in words is "one million, forty-seven thousand, eight hundred twenty-one".