5820421 has 2 divisors, whose sum is σ = 5820422. Its totient is φ = 5820420.

The previous prime is 5820389. The next prime is 5820431. The reversal of 5820421 is 1240285.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5808100 + 12321 = 2410^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 5820421 - 2⁵ = 5820389 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 5820392 and 5820401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5820431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2910210 + 2910211.

It is an arithmetic number, because the mean of its divisors is an integer number (2910211).

Almost surely, 2^5820421 is an apocalyptic number.

It is an amenable number.

5820421 is a deficient number, since it is larger than the sum of its proper divisors (1).

5820421 is an equidigital number, since it uses as much as digits as its factorization.

5820421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 5820421 is about 2412.5548698423. The cubic root of 5820421 is about 179.8807955603.

It can be divided in two parts, 5820 and 421, that added together give a square (6241 = 79²).

The spelling of 5820421 in words is "five million, eight hundred twenty thousand, four hundred twenty-one".