3405421 has 4 divisors (see below), whose sum is σ = 3463200. Its totient is φ = 3347644.

The previous prime is 3405397. The next prime is 3405431. The reversal of 3405421 is 1245043.

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: 1245043 = 193 ⋅6451.

It is a cyclic number.

It is not a de Polignac number, because 3405421 - 2⁷ = 3405293 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3405431) 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, 28801 + ... + 28918.

It is an arithmetic number, because the mean of its divisors is an integer number (865800).

Almost surely, 2^3405421 is an apocalyptic number.

It is an amenable number.

3405421 is a deficient number, since it is larger than the sum of its proper divisors (57779).

3405421 is an equidigital number, since it uses as much as digits as its factorization.

3405421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57778.

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 3405421 is about 1845.3782810037. The cubic root of 3405421 is about 150.4493341297.

The spelling of 3405421 in words is "three million, four hundred five thousand, four hundred twenty-one".