3728381 has 4 divisors (see below), whose sum is σ = 3789564. Its totient is φ = 3667200.

The previous prime is 3728377. The next prime is 3728393. The reversal of 3728381 is 1838273.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1838273 = 1031 ⋅1783.

It can be written as a sum of positive squares in 2 ways, for example, as 84100 + 3644281 = 290^2 + 1909^2 .

It is a cyclic number.

It is not a de Polignac number, because 3728381 - 2² = 3728377 is a prime.

It is a super-2 number, since 2×3728381² = 27801649762322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3728311) 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, 30500 + ... + 30621.

It is an arithmetic number, because the mean of its divisors is an integer number (947391).

Almost surely, 2^3728381 is an apocalyptic number.

It is an amenable number.

3728381 is a deficient number, since it is larger than the sum of its proper divisors (61183).

3728381 is an equidigital number, since it uses as much as digits as its factorization.

3728381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61182.

The product of its digits is 8064, while the sum is 32.

The square root of 3728381 is about 1930.9016028788. The cubic root of 3728381 is about 155.0624930108.

The spelling of 3728381 in words is "three million, seven hundred twenty-eight thousand, three hundred eighty-one".