3745221 has 4 divisors (see below), whose sum is σ = 4993632. Its totient is φ = 2496812.

The previous prime is 3745211. The next prime is 3745229. The reversal of 3745221 is 1225473.

3745221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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: 1225473 = 3 ⋅408491.

It is a cyclic number.

It is not a de Polignac number, because 3745221 - 2¹³ = 3737029 is a prime.

It is a D-number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3745191 and 3745200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3745229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 624201 + ... + 624206.

It is an arithmetic number, because the mean of its divisors is an integer number (1248408).

Almost surely, 2^3745221 is an apocalyptic number.

It is an amenable number.

3745221 is a deficient number, since it is larger than the sum of its proper divisors (1248411).

3745221 is a wasteful number, since it uses less digits than its factorization.

3745221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1248410.

The product of its digits is 1680, while the sum is 24.

The square root of 3745221 is about 1935.2573472280. The cubic root of 3745221 is about 155.2955996236.

It can be divided in two parts, 37452 and 21, that added together give a palindrome (37473).

The spelling of 3745221 in words is "three million, seven hundred forty-five thousand, two hundred twenty-one".