3421520 has 40 divisors (see below), whose sum is σ = 8377440. Its totient is φ = 1296000.

The previous prime is 3421513. The next prime is 3421531. The reversal of 3421520 is 251243.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×3421520² = 23413598220800, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 395 + ... + 2645.

It is an arithmetic number, because the mean of its divisors is an integer number (209436).

Almost surely, 2^3421520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3421520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4188720).

3421520 is an abundant number, since it is smaller than the sum of its proper divisors (4955920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3421520 is a wasteful number, since it uses less digits than its factorization.

3421520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283 (or 2277 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 3421520 is about 1849.7351161720. The cubic root of 3421520 is about 150.6860427044.

Adding to 3421520 its reverse (251243), we get a palindrome (3672763).

The spelling of 3421520 in words is "three million, four hundred twenty-one thousand, five hundred twenty".