3723281 has 4 divisors (see below), whose sum is σ = 3851700. Its totient is φ = 3594864.

The previous prime is 3723277. The next prime is 3723283. The reversal of 3723281 is 1823273.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1823273 = 307 ⋅5939.

It can be written as a sum of positive squares in 2 ways, for example, as 3097600 + 625681 = 1760^2 + 791^2 .

It is a cyclic number.

It is not a de Polignac number, because 3723281 - 2² = 3723277 is a prime.

It is a super-2 number, since 2×3723281² = 27725642809922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3723281.

It is not an unprimeable number, because it can be changed into a prime (3723283) 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, 64166 + ... + 64223.

It is an arithmetic number, because the mean of its divisors is an integer number (962925).

Almost surely, 2^3723281 is an apocalyptic number.

It is an amenable number.

3723281 is a deficient number, since it is larger than the sum of its proper divisors (128419).

3723281 is a wasteful number, since it uses less digits than its factorization.

3723281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128418.

The product of its digits is 2016, while the sum is 26.

The square root of 3723281 is about 1929.5805243627. The cubic root of 3723281 is about 154.9917581466.

It can be divided in two parts, 3723 and 281, that added together give a palindrome (4004).

The spelling of 3723281 in words is "three million, seven hundred twenty-three thousand, two hundred eighty-one".