3813421 has 2 divisors, whose sum is σ = 3813422. Its totient is φ = 3813420.

The previous prime is 3813419. The next prime is 3813427. The reversal of 3813421 is 1243183.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1990921 + 1822500 = 1411^2 + 1350^2 .

It is a cyclic number.

It is not a de Polignac number, because 3813421 - 2¹ = 3813419 is a prime.

Together with 3813419, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 3813392 and 3813401.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3813427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1906710 + 1906711.

It is an arithmetic number, because the mean of its divisors is an integer number (1906711).

Almost surely, 2^3813421 is an apocalyptic number.

It is an amenable number.

3813421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3813421 is an equidigital number, since it uses as much as digits as its factorization.

3813421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 22.

The square root of 3813421 is about 1952.7982486678. The cubic root of 3813421 is about 156.2325727763.

The spelling of 3813421 in words is "three million, eight hundred thirteen thousand, four hundred twenty-one".