3724221 has 4 divisors (see below), whose sum is σ = 4965632. Its totient is φ = 2482812.

The previous prime is 3724213. The next prime is 3724223. The reversal of 3724221 is 1224273.

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: 1224273 = 3 ⋅408091.

It is not a de Polignac number, because 3724221 - 2³ = 3724213 is a prime.

It is an Ulam number.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3724223) 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, 620701 + ... + 620706.

It is an arithmetic number, because the mean of its divisors is an integer number (1241408).

Almost surely, 2^3724221 is an apocalyptic number.

It is an amenable number.

3724221 is a deficient number, since it is larger than the sum of its proper divisors (1241411).

3724221 is a wasteful number, since it uses less digits than its factorization.

3724221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1241410.

The product of its digits is 672, while the sum is 21.

The square root of 3724221 is about 1929.8240852472. The cubic root of 3724221 is about 155.0048004063.

Adding to 3724221 its reverse (1224273), we get a palindrome (4948494).

The spelling of 3724221 in words is "three million, seven hundred twenty-four thousand, two hundred twenty-one".