12505215 has 32 divisors (see below), whose sum is σ = 21229056. Its totient is φ = 6272640.

The previous prime is 12505189. The next prime is 12505219. The reversal of 12505215 is 51250521.

It is not a de Polignac number, because 12505215 - 2⁶ = 12505151 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12505191 and 12505200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12505219) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22845 + ... + 23385.

It is an arithmetic number, because the mean of its divisors is an integer number (663408).

Almost surely, 2^12505215 is an apocalyptic number.

12505215 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12505215 is a deficient number, since it is larger than the sum of its proper divisors (8723841).

12505215 is a wasteful number, since it uses less digits than its factorization.

12505215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639.

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

The square root of 12505215 is about 3536.2713413990. The cubic root of 12505215 is about 232.1117117077. Note that the first 3 decimals are identical.

Adding to 12505215 its reverse (51250521), we get a palindrome (63755736).

It can be divided in two parts, 12505 and 215, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 12505215 in words is "twelve million, five hundred five thousand, two hundred fifteen".