3540021 has 8 divisors (see below), whose sum is σ = 4728864. Its totient is φ = 2355600.

The previous prime is 3539971. The next prime is 3540041. The reversal of 3540021 is 1200453.

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

It is not a de Polignac number, because 3540021 - 2⁶ = 3539957 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3540041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2071 + ... + 3371.

It is an arithmetic number, because the mean of its divisors is an integer number (591108).

Almost surely, 2^3540021 is an apocalyptic number.

It is an amenable number.

3540021 is a deficient number, since it is larger than the sum of its proper divisors (1188843).

3540021 is a wasteful number, since it uses less digits than its factorization.

3540021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2211.

The product of its (nonzero) digits is 120, while the sum is 15.

The square root of 3540021 is about 1881.4943529014. The cubic root of 3540021 is about 152.4059583234.

Adding to 3540021 its reverse (1200453), we get a palindrome (4740474).

The spelling of 3540021 in words is "three million, five hundred forty thousand, twenty-one".