3681021 has 8 divisors (see below), whose sum is σ = 5027904. Its totient is φ = 2394080.

The previous prime is 3681017. The next prime is 3681023. The reversal of 3681021 is 1201863.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3681021 - 2² = 3681017 is a prime.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3681023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14841 + ... + 15086.

It is an arithmetic number, because the mean of its divisors is an integer number (628488).

Almost surely, 2^3681021 is an apocalyptic number.

It is an amenable number.

3681021 is a deficient number, since it is larger than the sum of its proper divisors (1346883).

3681021 is a wasteful number, since it uses less digits than its factorization.

3681021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29971.

The product of its (nonzero) digits is 288, while the sum is 21.

The square root of 3681021 is about 1918.5987073904. The cubic root of 3681021 is about 154.4031294389.

Adding to 3681021 its reverse (1201863), we get a palindrome (4882884).

The spelling of 3681021 in words is "three million, six hundred eighty-one thousand, twenty-one".