3721906 has 8 divisors (see below), whose sum is σ = 5825664. Its totient is φ = 1780020.

The previous prime is 3721901. The next prime is 3721919. The reversal of 3721906 is 6091273.

3721906 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.

It is not an unprimeable number, because it can be changed into a prime (3721901) 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, 40410 + ... + 40501.

It is an arithmetic number, because the mean of its divisors is an integer number (728208).

Almost surely, 2^3721906 is an apocalyptic number.

3721906 is a deficient number, since it is larger than the sum of its proper divisors (2103758).

3721906 is a wasteful number, since it uses less digits than its factorization.

3721906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80936.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 3721906 is about 1929.2241964064. The cubic root of 3721906 is about 154.9726764185.

It can be divided in two parts, 372 and 1906, that added together give a triangular number (2278 = T₆₇).

The spelling of 3721906 in words is "three million, seven hundred twenty-one thousand, nine hundred six".