1076821 has 2 divisors, whose sum is σ = 1076822. Its totient is φ = 1076820.

The previous prime is 1076813. The next prime is 1076827. The reversal of 1076821 is 1286701.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 96721 = 990^2 + 311^2 .

It is a cyclic number.

It is not a de Polignac number, because 1076821 - 2³ = 1076813 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1076827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 538410 + 538411.

It is an arithmetic number, because the mean of its divisors is an integer number (538411).

2^1076821 is an apocalyptic number.

It is an amenable number.

1076821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1076821 is an equidigital number, since it uses as much as digits as its factorization.

1076821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 1076821 is about 1037.6998602679. The cubic root of 1076821 is about 102.4977909498.

It can be divided in two parts, 10768 and 21, that multiplied together give a triangular number (226128 = T₆₇₂).

The spelling of 1076821 in words is "one million, seventy-six thousand, eight hundred twenty-one".