3405521 has 4 divisors (see below), whose sum is σ = 3892032. Its totient is φ = 2919012.

The previous prime is 3405509. The next prime is 3405527. The reversal of 3405521 is 1255043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1255043 = 83 ⋅15121.

It is a cyclic number.

It is not a de Polignac number, because 3405521 - 2¹⁰ = 3404497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3405493 and 3405502.

It is not an unprimeable number, because it can be changed into a prime (3405527) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 243245 + ... + 243258.

It is an arithmetic number, because the mean of its divisors is an integer number (973008).

Almost surely, 2^3405521 is an apocalyptic number.

It is an amenable number.

3405521 is a deficient number, since it is larger than the sum of its proper divisors (486511).

3405521 is an equidigital number, since it uses as much as digits as its factorization.

3405521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486510.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 3405521 is about 1845.4053755205. The cubic root of 3405521 is about 150.4508067608.

The spelling of 3405521 in words is "three million, four hundred five thousand, five hundred twenty-one".