3721720 has 64 divisors (see below), whose sum is σ = 9072000. Its totient is φ = 1369728.

The previous prime is 3721717. The next prime is 3721721. The reversal of 3721720 is 271273.

It is a junction number, because it is equal to n+sod(n) for n = 3721691 and 3721700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721721) 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, 44799 + ... + 44881.

It is an arithmetic number, because the mean of its divisors is an integer number (141750).

Almost surely, 2^3721720 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 3721720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4536000).

3721720 is an abundant number, since it is smaller than the sum of its proper divisors (5350280).

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

3721720 is a wasteful number, since it uses less digits than its factorization.

3721720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 588, while the sum is 22.

The square root of 3721720 is about 1929.1759898983. The cubic root of 3721720 is about 154.9700948202.

Adding to 3721720 its reverse (271273), we get a palindrome (3992993).

The spelling of 3721720 in words is "three million, seven hundred twenty-one thousand, seven hundred twenty".