4398421 has 2 divisors, whose sum is σ = 4398422. Its totient is φ = 4398420.

The previous prime is 4398397. The next prime is 4398431. The reversal of 4398421 is 1248934.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4056196 + 342225 = 2014^2 + 585^2 .

It is a cyclic number.

It is not a de Polignac number, because 4398421 - 2⁷ = 4398293 is a prime.

It is a super-2 number, since 2×4398421² = 38692214586482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4398431) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2199210 + 2199211.

It is an arithmetic number, because the mean of its divisors is an integer number (2199211).

Almost surely, 2^4398421 is an apocalyptic number.

It is an amenable number.

4398421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4398421 is an equidigital number, since it uses as much as digits as its factorization.

4398421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6912, while the sum is 31.

The square root of 4398421 is about 2097.2412832099. The cubic root of 4398421 is about 163.8446501342.

The spelling of 4398421 in words is "four million, three hundred ninety-eight thousand, four hundred twenty-one".