3120520 has 64 divisors (see below), whose sum is σ = 8028720. Its totient is φ = 1081344.

The previous prime is 3120499. The next prime is 3120527. The reversal of 3120520 is 250213.

It can be written as a sum of positive squares in 8 ways, for example, as 1052676 + 2067844 = 1026^2 + 1438^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 3120520.

It is not an unprimeable number, because it can be changed into a prime (3120527) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8664 + ... + 9016.

Almost surely, 2^3120520 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 3120520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4014360).

3120520 is an abundant number, since it is smaller than the sum of its proper divisors (4908200).

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

3120520 is a wasteful number, since it uses less digits than its factorization.

3120520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 60, while the sum is 13.

The square root of 3120520 is about 1766.4993631474. The cubic root of 3120520 is about 146.1309889676.

Adding to 3120520 its reverse (250213), we get a palindrome (3370733).

It can be divided in two parts, 31205 and 20, that multiplied together give a square (624100 = 790²).

The spelling of 3120520 in words is "three million, one hundred twenty thousand, five hundred twenty".