3420621 has 24 divisors (see below), whose sum is σ = 5316480. Its totient is φ = 2111616.

The previous prime is 3420617. The next prime is 3420631. The reversal of 3420621 is 1260243.

It is a happy number.

3420621 is a `hidden beast` number, since 3 + 42 + 0 + 621 = 666.

3420621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3420621 - 2² = 3420617 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3420594 and 3420603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3420601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11946 + ... + 12228.

It is an arithmetic number, because the mean of its divisors is an integer number (221520).

Almost surely, 2^3420621 is an apocalyptic number.

It is an amenable number.

3420621 is a deficient number, since it is larger than the sum of its proper divisors (1895859).

3420621 is a wasteful number, since it uses less digits than its factorization.

3420621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385 (or 382 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 3420621 is about 1849.4920924405. The cubic root of 3420621 is about 150.6728440267.

Adding to 3420621 its reverse (1260243), we get a palindrome (4680864).

The spelling of 3420621 in words is "three million, four hundred twenty thousand, six hundred twenty-one".