74821 has 2 divisors, whose sum is σ = 74822. Its totient is φ = 74820.

The previous prime is 74797. The next prime is 74827. The reversal of 74821 is 12847.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 62500 + 12321 = 250^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 74821 - 2¹³ = 66629 is a prime.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 74792 and 74801.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (74827) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 37410 + 37411.

It is an arithmetic number, because the mean of its divisors is an integer number (37411).

2⁷⁴⁸²¹ is an apocalyptic number.

It is an amenable number.

74821 is a deficient number, since it is larger than the sum of its proper divisors (1).

74821 is an equidigital number, since it uses as much as digits as its factorization.

74821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 448, while the sum is 22.

The square root of 74821 is about 273.5342757316. The cubic root of 74821 is about 42.1380566617.

The spelling of 74821 in words is "seventy-four thousand, eight hundred twenty-one".