4086421 has 2 divisors, whose sum is σ = 4086422. Its totient is φ = 4086420.

The previous prime is 4086413. The next prime is 4086427. The reversal of 4086421 is 1246804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2907025 + 1179396 = 1705^2 + 1086^2 .

It is a cyclic number.

It is not a de Polignac number, because 4086421 - 2³ = 4086413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4086427) 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, 2043210 + 2043211.

It is an arithmetic number, because the mean of its divisors is an integer number (2043211).

Almost surely, 2^4086421 is an apocalyptic number.

It is an amenable number.

4086421 is a deficient number, since it is larger than the sum of its proper divisors (1).

4086421 is an equidigital number, since it uses as much as digits as its factorization.

4086421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1536, while the sum is 25.

The square root of 4086421 is about 2021.4897971546. The cubic root of 4086421 is about 159.8751760815.

The spelling of 4086421 in words is "four million, eighty-six thousand, four hundred twenty-one".