3721905 has 48 divisors (see below), whose sum is σ = 7203456. Its totient is φ = 1762560.

The previous prime is 3721901. The next prime is 3721919. The reversal of 3721905 is 5091273.

3721905 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3721905 - 2² = 3721901 is a prime.

It is a Smith number, since the sum of its digits (27) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

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 47 ways as a sum of consecutive naturals, for example, 36084 + ... + 36186.

It is an arithmetic number, because the mean of its divisors is an integer number (150072).

Almost surely, 2^3721905 is an apocalyptic number.

It is an amenable number.

3721905 is a deficient number, since it is larger than the sum of its proper divisors (3481551).

3721905 is a wasteful number, since it uses less digits than its factorization.

3721905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198 (or 195 counting only the distinct ones).

The product of its (nonzero) digits is 1890, while the sum is 27.

The square root of 3721905 is about 1929.2239372349. The cubic root of 3721905 is about 154.9726625391.

The spelling of 3721905 in words is "three million, seven hundred twenty-one thousand, nine hundred five".