3703721 has 4 divisors (see below), whose sum is σ = 4232832. Its totient is φ = 3174612.

The previous prime is 3703703. The next prime is 3703723. The reversal of 3703721 is 1273073.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1273073 = 23 ⋅55351.

It is not a de Polignac number, because 3703721 - 2¹⁰ = 3702697 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (3703723) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 264545 + ... + 264558.

It is an arithmetic number, because the mean of its divisors is an integer number (1058208).

Almost surely, 2^3703721 is an apocalyptic number.

It is an amenable number.

3703721 is a deficient number, since it is larger than the sum of its proper divisors (529111).

3703721 is an equidigital number, since it uses as much as digits as its factorization.

3703721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529110.

The product of its (nonzero) digits is 882, while the sum is 23.

The square root of 3703721 is about 1924.5053910031. The cubic root of 3703721 is about 154.7198686336.

Adding to 3703721 its reverse (1273073), we get a palindrome (4976794).

It can be divided in two parts, 37037 and 21, that multiplied together give a palindrome (777777).

The spelling of 3703721 in words is "three million, seven hundred three thousand, seven hundred twenty-one".