3738821 has 4 divisors (see below), whose sum is σ = 3745644. Its totient is φ = 3732000.

The previous prime is 3738781. The next prime is 3738829. The reversal of 3738821 is 1288373.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1288373 = 761 ⋅1693.

It can be written as a sum of positive squares in 2 ways, for example, as 1473796 + 2265025 = 1214^2 + 1505^2 .

It is a cyclic number.

It is not a de Polignac number, because 3738821 - 2¹⁴ = 3722437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3738829) 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, 2510 + ... + 3711.

It is an arithmetic number, because the mean of its divisors is an integer number (936411).

Almost surely, 2^3738821 is an apocalyptic number.

It is an amenable number.

3738821 is a deficient number, since it is larger than the sum of its proper divisors (6823).

3738821 is an equidigital number, since it uses as much as digits as its factorization.

3738821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6822.

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

The square root of 3738821 is about 1933.6031133612. The cubic root of 3738821 is about 155.2070905155.

The spelling of 3738821 in words is "three million, seven hundred thirty-eight thousand, eight hundred twenty-one".