4121520 has 80 divisors (see below), whose sum is σ = 13769952. Its totient is φ = 1013760.

The previous prime is 4121503. The next prime is 4121527. The reversal of 4121520 is 251214.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×4121520² = 33973854220800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 4121520.

It is not an unprimeable number, because it can be changed into a prime (4121527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2460 + ... + 3780.

Almost surely, 2^4121520 is an apocalyptic number.

4121520 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4121520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (6884976).

4121520 is an abundant number, since it is smaller than the sum of its proper divisors (9648432).

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

4121520 is a wasteful number, since it uses less digits than its factorization.

4121520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1350 (or 1344 counting only the distinct ones).

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 4121520 is about 2030.1527036162. The cubic root of 4121520 is about 160.3316039346.

Adding to 4121520 its reverse (251214), we get a palindrome (4372734).

The spelling of 4121520 in words is "four million, one hundred twenty-one thousand, five hundred twenty".