4818421 has 2 divisors, whose sum is σ = 4818422. Its totient is φ = 4818420.

The previous prime is 4818413. The next prime is 4818461. The reversal of 4818421 is 1248184.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3944196 + 874225 = 1986^2 + 935^2 .

It is a cyclic number.

It is not a de Polignac number, because 4818421 - 2³ = 4818413 is a prime.

It is equal to p₃₃₆₆₄₆ and since 4818421 and 336646 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4818421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4818461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2409210 + 2409211.

It is an arithmetic number, because the mean of its divisors is an integer number (2409211).

Almost surely, 2^4818421 is an apocalyptic number.

It is an amenable number.

4818421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4818421 is an equidigital number, since it uses as much as digits as its factorization.

4818421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2048, while the sum is 28.

The square root of 4818421 is about 2195.0902031579. The cubic root of 4818421 is about 168.9020475057.

It can be divided in two parts, 48184 and 21, that added together give a triangular number (48205 = T₃₁₀).

The spelling of 4818421 in words is "four million, eight hundred eighteen thousand, four hundred twenty-one".