3721530 has 32 divisors (see below), whose sum is σ = 9403200. Its totient is φ = 940032.

The previous prime is 3721489. The next prime is 3721537. The reversal of 3721530 is 351273.

It is a happy number.

3721530 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 3721497 and 3721506.

It is not an unprimeable number, because it can be changed into a prime (3721537) 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 15 ways as a sum of consecutive naturals, for example, 2695 + ... + 3834.

It is an arithmetic number, because the mean of its divisors is an integer number (293850).

Almost surely, 2^3721530 is an apocalyptic number.

3721530 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

3721530 is an abundant number, since it is smaller than the sum of its proper divisors (5681670).

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

3721530 is a wasteful number, since it uses less digits than its factorization.

3721530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6558.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 3721530 is about 1929.1267454473. The cubic root of 3721530 is about 154.9674576149.

The spelling of 3721530 in words is "three million, seven hundred twenty-one thousand, five hundred thirty".