4008421 has 2 divisors, whose sum is σ = 4008422. Its totient is φ = 4008420.

The previous prime is 4008397. The next prime is 4008427. The reversal of 4008421 is 1248004.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3744225 + 264196 = 1935^2 + 514^2 .

It is a cyclic number.

It is not a de Polignac number, because 4008421 - 2²¹ = 1911269 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4008427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2004210 + 2004211.

It is an arithmetic number, because the mean of its divisors is an integer number (2004211).

Almost surely, 2^4008421 is an apocalyptic number.

It is an amenable number.

4008421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4008421 is an equidigital number, since it uses as much as digits as its factorization.

4008421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 256, while the sum is 19.

The square root of 4008421 is about 2002.1041431454. The cubic root of 4008421 is about 158.8514229849.

The spelling of 4008421 in words is "four million, eight thousand, four hundred twenty-one".