3639421 has 2 divisors, whose sum is σ = 3639422. Its totient is φ = 3639420.

The previous prime is 3639409. The next prime is 3639473. The reversal of 3639421 is 1249363.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3348900 + 290521 = 1830^2 + 539^2 .

It is an emirp because it is prime and its reverse (1249363) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3639421 - 2⁹ = 3638909 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 3639421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3639481) 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, 1819710 + 1819711.

It is an arithmetic number, because the mean of its divisors is an integer number (1819711).

Almost surely, 2^3639421 is an apocalyptic number.

It is an amenable number.

3639421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3639421 is an equidigital number, since it uses as much as digits as its factorization.

3639421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 28.

The square root of 3639421 is about 1907.7266575692. The cubic root of 3639421 is about 153.8192769523.

The spelling of 3639421 in words is "three million, six hundred thirty-nine thousand, four hundred twenty-one".