3504721 has 16 divisors (see below), whose sum is σ = 4132800. Its totient is φ = 2937600.

The previous prime is 3504719. The next prime is 3504727. The reversal of 3504721 is 1274053.

It is a 3-Lehmer number, since φ(3504721) divides (3504721-1)³.

It is a cyclic number.

It is not a de Polignac number, because 3504721 - 2¹ = 3504719 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3504692 and 3504701.

It is not an unprimeable number, because it can be changed into a prime (3504727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8365 + ... + 8773.

It is an arithmetic number, because the mean of its divisors is an integer number (258300).

Almost surely, 2^3504721 is an apocalyptic number.

It is an amenable number.

3504721 is a deficient number, since it is larger than the sum of its proper divisors (628079).

3504721 is a wasteful number, since it uses less digits than its factorization.

3504721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 480.

The product of its (nonzero) digits is 840, while the sum is 22.

The square root of 3504721 is about 1872.0900085199. The cubic root of 3504721 is about 151.8976833354.

Adding to 3504721 its reverse (1274053), we get a palindrome (4778774).

It can be divided in two parts, 3504 and 721, that added together give a square (4225 = 65²).

The spelling of 3504721 in words is "three million, five hundred four thousand, seven hundred twenty-one".