3721806 has 24 divisors (see below), whose sum is σ = 8797464. Its totient is φ = 1127760.

The previous prime is 3721799. The next prime is 3721807. The reversal of 3721806 is 6081273.

3721806 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 3721806.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3721807) 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 11 ways as a sum of consecutive naturals, for example, 9201 + ... + 9596.

It is an arithmetic number, because the mean of its divisors is an integer number (366561).

Almost surely, 2^3721806 is an apocalyptic number.

3721806 is an abundant number, since it is smaller than the sum of its proper divisors (5075658).

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

3721806 is a wasteful number, since it uses less digits than its factorization.

3721806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18816 (or 18813 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 3721806 is about 1929.1982790786. The cubic root of 3721806 is about 154.9712884731.

The spelling of 3721806 in words is "three million, seven hundred twenty-one thousand, eight hundred six".