3960421 has 2 divisors, whose sum is σ = 3960422. Its totient is φ = 3960420.

The previous prime is 3960419. The next prime is 3960427. The reversal of 3960421 is 1240693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3663396 + 297025 = 1914^2 + 545^2 .

It is a cyclic number.

It is not a de Polignac number, because 3960421 - 2¹ = 3960419 is a prime.

Together with 3960419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3960427) 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, 1980210 + 1980211.

It is an arithmetic number, because the mean of its divisors is an integer number (1980211).

Almost surely, 2^3960421 is an apocalyptic number.

It is an amenable number.

3960421 is a deficient number, since it is larger than the sum of its proper divisors (1).

3960421 is an equidigital number, since it uses as much as digits as its factorization.

3960421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 3960421 is about 1990.0806516320. The cubic root of 3960421 is about 158.2148042424.

The spelling of 3960421 in words is "three million, nine hundred sixty thousand, four hundred twenty-one".