3402521 has 2 divisors, whose sum is σ = 3402522. Its totient is φ = 3402520.

The previous prime is 3402517. The next prime is 3402523. The reversal of 3402521 is 1252043.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3115225 + 287296 = 1765^2 + 536^2 .

It is a cyclic number.

It is not a de Polignac number, because 3402521 - 2² = 3402517 is a prime.

Together with 3402523, it forms a pair of twin primes.

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 3402521.

It is not a weakly prime, because it can be changed into another prime (3402523) 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, 1701260 + 1701261.

It is an arithmetic number, because the mean of its divisors is an integer number (1701261).

Almost surely, 2^3402521 is an apocalyptic number.

It is an amenable number.

3402521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3402521 is an equidigital number, since it uses as much as digits as its factorization.

3402521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 3402521 is about 1844.5923668930. The cubic root of 3402521 is about 150.4066152826.

Adding to 3402521 its reverse (1252043), we get a palindrome (4654564).

The spelling of 3402521 in words is "three million, four hundred two thousand, five hundred twenty-one".