3405621 has 8 divisors (see below), whose sum is σ = 4626720. Its totient is φ = 2227472.

The previous prime is 3405613. The next prime is 3405637. The reversal of 3405621 is 1265043.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3405621 - 2³ = 3405613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3405601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10551 + ... + 10868.

It is an arithmetic number, because the mean of its divisors is an integer number (578340).

Almost surely, 2^3405621 is an apocalyptic number.

It is an amenable number.

3405621 is a deficient number, since it is larger than the sum of its proper divisors (1221099).

3405621 is a wasteful number, since it uses less digits than its factorization.

3405621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21475.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 3405621 is about 1845.4324696396. The cubic root of 3405621 is about 150.4522793630.

The spelling of 3405621 in words is "three million, four hundred five thousand, six hundred twenty-one".