12117015 has 24 divisors (see below), whose sum is σ = 21097440. Its totient is φ = 6433344.

The previous prime is 12117011. The next prime is 12117031. The reversal of 12117015 is 51071121.

It is a happy number.

12117015 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12117015 - 2² = 12117011 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12117011) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 12726 + ... + 13644.

It is an arithmetic number, because the mean of its divisors is an integer number (879060).

Almost surely, 2^12117015 is an apocalyptic number.

12117015 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12117015 is a deficient number, since it is larger than the sum of its proper divisors (8980425).

12117015 is a wasteful number, since it uses less digits than its factorization.

12117015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223 (or 1220 counting only the distinct ones).

The product of its (nonzero) digits is 70, while the sum is 18.

The square root of 12117015 is about 3480.9503012827. The cubic root of 12117015 is about 229.6846023513.

Adding to 12117015 its reverse (51071121), we get a palindrome (63188136).

The spelling of 12117015 in words is "twelve million, one hundred seventeen thousand, fifteen".