3913421 has 2 divisors, whose sum is σ = 3913422. Its totient is φ = 3913420.

The previous prime is 3913397. The next prime is 3913489. The reversal of 3913421 is 1243193.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2941225 + 972196 = 1715^2 + 986^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3913421 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3913121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1956710 + 1956711.

It is an arithmetic number, because the mean of its divisors is an integer number (1956711).

Almost surely, 2^3913421 is an apocalyptic number.

It is an amenable number.

3913421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3913421 is an equidigital number, since it uses as much as digits as its factorization.

3913421 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 648, while the sum is 23.

The square root of 3913421 is about 1978.2368412301. The cubic root of 3913421 is about 157.5864445254.

It can be divided in two parts, 3913 and 421, that added together give a palindrome (4334).

The spelling of 3913421 in words is "three million, nine hundred thirteen thousand, four hundred twenty-one".