3521620 has 12 divisors (see below), whose sum is σ = 7395444. Its totient is φ = 1408640.

The previous prime is 3521561. The next prime is 3521627. The reversal of 3521620 is 261253.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 2414916 + 1106704 = 1554^2 + 1052^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3521627) 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, 88021 + ... + 88060.

It is an arithmetic number, because the mean of its divisors is an integer number (616287).

Almost surely, 2^3521620 is an apocalyptic number.

It is an amenable number.

3521620 is an abundant number, since it is smaller than the sum of its proper divisors (3873824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3521620 is a wasteful number, since it uses less digits than its factorization.

3521620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176090 (or 176088 counting only the distinct ones).

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

The square root of 3521620 is about 1876.5979857178. The cubic root of 3521620 is about 152.1414311506.

Adding to 3521620 its reverse (261253), we get a palindrome (3782873).

The spelling of 3521620 in words is "three million, five hundred twenty-one thousand, six hundred twenty".