3520409 has 4 divisors (see below), whose sum is σ = 3524304. Its totient is φ = 3516516.

The previous prime is 3520399. The next prime is 3520427. The reversal of 3520409 is 9040253.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 3520409 - 2¹² = 3516313 is a prime.

It is a super-3 number, since 3×3520409³ (a number of 21 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3520499) 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, 194 + ... + 2660.

It is an arithmetic number, because the mean of its divisors is an integer number (881076).

Almost surely, 2^3520409 is an apocalyptic number.

It is an amenable number.

3520409 is a deficient number, since it is larger than the sum of its proper divisors (3895).

3520409 is a wasteful number, since it uses less digits than its factorization.

3520409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894.

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 3520409 is about 1876.2752996296. The cubic root of 3520409 is about 152.1239898976.

The spelling of 3520409 in words is "three million, five hundred twenty thousand, four hundred nine".