3520621 has 8 divisors (see below), whose sum is σ = 3828384. Its totient is φ = 3218160.

The previous prime is 3520613. The next prime is 3520663. The reversal of 3520621 is 1260253.

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 3520621 - 2³ = 3520613 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 (3520691) 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 in 7 ways as a sum of consecutive naturals, for example, 126 + ... + 2656.

It is an arithmetic number, because the mean of its divisors is an integer number (478548).

Almost surely, 2^3520621 is an apocalyptic number.

It is an amenable number.

3520621 is a deficient number, since it is larger than the sum of its proper divisors (307763).

3520621 is a wasteful number, since it uses less digits than its factorization.

3520621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2651.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 3520621 is about 1876.3317936868. The cubic root of 3520621 is about 152.1270434858.

Adding to 3520621 its reverse (1260253), we get a palindrome (4780874).

The spelling of 3520621 in words is "three million, five hundred twenty thousand, six hundred twenty-one".