3504021 has 4 divisors (see below), whose sum is σ = 4672032. Its totient is φ = 2336012.

The previous prime is 3504013. The next prime is 3504031. The reversal of 3504021 is 1204053.

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.

It is a cyclic number.

It is not a de Polignac number, because 3504021 - 2³ = 3504013 is a prime.

It is a D-number.

3504021 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3504001) 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, 584001 + ... + 584006.

It is an arithmetic number, because the mean of its divisors is an integer number (1168008).

Almost surely, 2^3504021 is an apocalyptic number.

It is an amenable number.

3504021 is a deficient number, since it is larger than the sum of its proper divisors (1168011).

3504021 is a wasteful number, since it uses less digits than its factorization.

3504021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168010.

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

The square root of 3504021 is about 1871.9030423609. The cubic root of 3504021 is about 151.8875697906.

Adding to 3504021 its reverse (1204053), we get a palindrome (4708074).

Subtracting from 3504021 its reverse (1204053), we obtain a cube (2299968 = 132³).

It can be divided in two parts, 350 and 4021, that added together give a triangular number (4371 = T₉₃).

The spelling of 3504021 in words is "three million, five hundred four thousand, twenty-one".