3654021 has 16 divisors (see below), whose sum is σ = 5603328. Its totient is φ = 2074800.

The previous prime is 3654017. The next prime is 3654037. The reversal of 3654021 is 1204563.

It is a happy number.

3654021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 3654021 - 2² = 3654017 is a prime.

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

3654021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3654421) 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 15 ways as a sum of consecutive naturals, for example, 3556 + ... + 4466.

It is an arithmetic number, because the mean of its divisors is an integer number (350208).

Almost surely, 2^3654021 is an apocalyptic number.

It is an amenable number.

3654021 is a deficient number, since it is larger than the sum of its proper divisors (1949307).

3654021 is a wasteful number, since it uses less digits than its factorization.

3654021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1112.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 3654021 is about 1911.5493715832. The cubic root of 3654021 is about 154.0246910430.

Adding to 3654021 its reverse (1204563), we get a palindrome (4858584).

The spelling of 3654021 in words is "three million, six hundred fifty-four thousand, twenty-one".