3721818 has 8 divisors (see below), whose sum is σ = 7443648. Its totient is φ = 1240604.

The previous prime is 3721813. The next prime is 3721847. The reversal of 3721818 is 8181273.

It is a happy number.

3721818 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

3721818 is an admirable number.

3721818 is a modest number, since divided by 1818 gives 372 as remainder.

It is not an unprimeable number, because it can be changed into a prime (3721811) 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 3 ways as a sum of consecutive naturals, for example, 310146 + ... + 310157.

It is an arithmetic number, because the mean of its divisors is an integer number (930456).

Almost surely, 2^3721818 is an apocalyptic number.

3721818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

3721818 is a wasteful number, since it uses less digits than its factorization.

3721818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620308.

The product of its digits is 2688, while the sum is 30.

The square root of 3721818 is about 1929.2013891764. The cubic root of 3721818 is about 154.9714550279.

The spelling of 3721818 in words is "three million, seven hundred twenty-one thousand, eight hundred eighteen".