3721903 has 4 divisors (see below), whose sum is σ = 3742648. Its totient is φ = 3701160.

The previous prime is 3721901. The next prime is 3721919. The reversal of 3721903 is 3091273.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3721903 - 2¹ = 3721901 is a prime.

It is a Duffinian number.

3721903 is a lucky number.

It is a congruent 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10101 + ... + 10462.

It is an arithmetic number, because the mean of its divisors is an integer number (935662).

Almost surely, 2^3721903 is an apocalyptic number.

3721903 is a deficient number, since it is larger than the sum of its proper divisors (20745).

3721903 is a wasteful number, since it uses less digits than its factorization.

3721903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20744.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 3721903 is about 1929.2234188917. The cubic root of 3721903 is about 154.9726347805.

It can be divided in two parts, 3721 and 903, that added together give a square (4624 = 68²).

The spelling of 3721903 in words is "three million, seven hundred twenty-one thousand, nine hundred three".