3635021 has 12 divisors (see below), whose sum is σ = 3990132. Its totient is φ = 3309696.

The previous prime is 3635011. The next prime is 3635057. The reversal of 3635021 is 1205363.

It can be written as a sum of positive squares in 6 ways, for example, as 697225 + 2937796 = 835^2 + 1714^2 .

It is a de Polignac number, because none of the positive numbers 2^k-3635021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3634984 and 3635002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3635011) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23075 + ... + 23231.

It is an arithmetic number, because the mean of its divisors is an integer number (332511).

Almost surely, 2^3635021 is an apocalyptic number.

It is an amenable number.

3635021 is a deficient number, since it is larger than the sum of its proper divisors (355111).

3635021 is a wasteful number, since it uses less digits than its factorization.

3635021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320 (or 307 counting only the distinct ones).

The product of its (nonzero) digits is 540, while the sum is 20.

The square root of 3635021 is about 1906.5731037650. The cubic root of 3635021 is about 153.7572636311.

The spelling of 3635021 in words is "three million, six hundred thirty-five thousand, twenty-one".