11520405 has 48 divisors (see below), whose sum is σ = 22014720. Its totient is φ = 5537664.

The previous prime is 11520391. The next prime is 11520409. The reversal of 11520405 is 50402511.

It is not a de Polignac number, because 11520405 - 2¹⁰ = 11519381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11520409) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 27286 + ... + 27704.

It is an arithmetic number, because the mean of its divisors is an integer number (458640).

Almost surely, 2^11520405 is an apocalyptic number.

11520405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

11520405 is a deficient number, since it is larger than the sum of its proper divisors (10494315).

11520405 is a wasteful number, since it uses less digits than its factorization.

11520405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 11520405 is about 3394.1722113057. The cubic root of 11520405 is about 225.8512935643.

Adding to 11520405 its reverse (50402511), we get a palindrome (61922916).

It can be divided in two parts, 11520 and 405, that multiplied together give a square (4665600 = 2160²).

The spelling of 11520405 in words is "eleven million, five hundred twenty thousand, four hundred five".