3733721 has 4 divisors (see below), whose sum is σ = 3862500. Its totient is φ = 3604944.

The previous prime is 3733703. The next prime is 3733729. The reversal of 3733721 is 1273373.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1273373 = 359 ⋅3547.

It can be written as a sum of positive squares in 2 ways, for example, as 978121 + 2755600 = 989^2 + 1660^2 .

It is a cyclic number.

It is not a de Polignac number, because 3733721 - 2¹⁰ = 3732697 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 (3733729) 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, 64346 + ... + 64403.

It is an arithmetic number, because the mean of its divisors is an integer number (965625).

Almost surely, 2^3733721 is an apocalyptic number.

It is an amenable number.

3733721 is a deficient number, since it is larger than the sum of its proper divisors (128779).

3733721 is a wasteful number, since it uses less digits than its factorization.

3733721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128778.

The product of its digits is 2646, while the sum is 26.

The square root of 3733721 is about 1932.2838818352. The cubic root of 3733721 is about 155.1364874790.

It can be divided in two parts, 373372 and 1, that added together give a palindrome (373373).

The spelling of 3733721 in words is "three million, seven hundred thirty-three thousand, seven hundred twenty-one".