3654221 has 4 divisors (see below), whose sum is σ = 3666432. Its totient is φ = 3642012.

The previous prime is 3654199. The next prime is 3654227. The reversal of 3654221 is 1224563.

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: 1224563 = 347 ⋅3529.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3654221 is a prime.

It is a super-2 number, since 2×3654221² = 26706662233682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3654227) 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, 5645 + ... + 6258.

It is an arithmetic number, because the mean of its divisors is an integer number (916608).

Almost surely, 2^3654221 is an apocalyptic number.

It is an amenable number.

3654221 is a deficient number, since it is larger than the sum of its proper divisors (12211).

3654221 is a wasteful number, since it uses less digits than its factorization.

3654221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12210.

The product of its digits is 1440, while the sum is 23.

The square root of 3654221 is about 1911.6016844521. The cubic root of 3654221 is about 154.0275011323.

Adding to 3654221 its reverse (1224563), we get a palindrome (4878784).

It can be divided in two parts, 36542 and 21, that added together give a palindrome (36563).

The spelling of 3654221 in words is "three million, six hundred fifty-four thousand, two hundred twenty-one".