12205515 has 16 divisors (see below), whose sum is σ = 22318848. Its totient is φ = 5579616.

The previous prime is 12205511. The next prime is 12205553. The reversal of 12205515 is 51550221.

It is not a de Polignac number, because 12205515 - 2² = 12205511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a junction number, because it is equal to n+sod(n) for n = 12205491 and 12205500.

It is not an unprimeable number, because it can be changed into a prime (12205511) 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, 58017 + ... + 58226.

It is an arithmetic number, because the mean of its divisors is an integer number (1394928).

Almost surely, 2^12205515 is an apocalyptic number.

12205515 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12205515 is a deficient number, since it is larger than the sum of its proper divisors (10113333).

12205515 is a wasteful number, since it uses less digits than its factorization.

12205515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116258.

The product of its (nonzero) digits is 500, while the sum is 21.

The square root of 12205515 is about 3493.6392200684. The cubic root of 12205515 is about 230.2424349792.

Adding to 12205515 its reverse (51550221), we get a palindrome (63755736).

It can be divided in two parts, 12205 and 515, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 12205515 in words is "twelve million, two hundred five thousand, five hundred fifteen".