1358821 has 2 divisors, whose sum is σ = 1358822. Its totient is φ = 1358820.

The previous prime is 1358813. The next prime is 1358831. The reversal of 1358821 is 1288531.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1028196 + 330625 = 1014^2 + 575^2 .

It is an emirp because it is prime and its reverse (1288531) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1358821 - 2³ = 1358813 is a prime.

1358821 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1358821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1358801) 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, 679410 + 679411.

It is an arithmetic number, because the mean of its divisors is an integer number (679411).

2^1358821 is an apocalyptic number.

It is an amenable number.

1358821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1358821 is an equidigital number, since it uses as much as digits as its factorization.

1358821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1920, while the sum is 28.

The square root of 1358821 is about 1165.6847772876. The cubic root of 1358821 is about 110.7611399129.

The spelling of 1358821 in words is "one million, three hundred fifty-eight thousand, eight hundred twenty-one".