3742221 has 32 divisors (see below), whose sum is σ = 6128640. Its totient is φ = 1983744.

The previous prime is 3742201. The next prime is 3742223. The reversal of 3742221 is 1222473.

It is not a de Polignac number, because 3742221 - 2¹⁰ = 3741197 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3742223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33061 + ... + 33173.

It is an arithmetic number, because the mean of its divisors is an integer number (191520).

Almost surely, 2^3742221 is an apocalyptic number.

It is an amenable number.

3742221 is a deficient number, since it is larger than the sum of its proper divisors (2386419).

3742221 is a wasteful number, since it uses less digits than its factorization.

3742221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225.

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

The square root of 3742221 is about 1934.4821012354. The cubic root of 3742221 is about 155.2541235443.

Adding to 3742221 its reverse (1222473), we get a palindrome (4964694).

The spelling of 3742221 in words is "three million, seven hundred forty-two thousand, two hundred twenty-one".