3521320 has 64 divisors (see below), whose sum is σ = 8864640. Its totient is φ = 1248000.

The previous prime is 3521303. The next prime is 3521341. The reversal of 3521320 is 231253.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 3521294 and 3521303.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23245 + ... + 23395.

It is an arithmetic number, because the mean of its divisors is an integer number (138510).

Almost surely, 2^3521320 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3521320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4432320).

3521320 is an abundant number, since it is smaller than the sum of its proper divisors (5343320).

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

3521320 is a wasteful number, since it uses less digits than its factorization.

3521320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226 (or 222 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 16.

The square root of 3521320 is about 1876.5180521381. The cubic root of 3521320 is about 152.1371108164.

Adding to 3521320 its reverse (231253), we get a palindrome (3752573).

The spelling of 3521320 in words is "three million, five hundred twenty-one thousand, three hundred twenty".