5390821 has 2 divisors, whose sum is σ = 5390822. Its totient is φ = 5390820.

The previous prime is 5390797. The next prime is 5390857. The reversal of 5390821 is 1280935.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3568321 + 1822500 = 1889^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 5390821 - 2¹⁵ = 5358053 is a prime.

It is a Chen prime.

5390821 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 5390821.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5390521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2695410 + 2695411.

It is an arithmetic number, because the mean of its divisors is an integer number (2695411).

Almost surely, 2^5390821 is an apocalyptic number.

5390821 is the 1341-st hex number.

It is an amenable number.

5390821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5390821 is an equidigital number, since it uses as much as digits as its factorization.

5390821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 5390821 is about 2321.8141613833. The cubic root of 5390821 is about 175.3416021423.

The spelling of 5390821 in words is "five million, three hundred ninety thousand, eight hundred twenty-one".