12155615 has 8 divisors (see below), whose sum is σ = 15221088. Its totient is φ = 9301600.

The previous prime is 12155587. The next prime is 12155617. The reversal of 12155615 is 51655121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12155615 - 2¹⁶ = 12090079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12155617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52736 + ... + 52965.

It is an arithmetic number, because the mean of its divisors is an integer number (1902636).

Almost surely, 2^12155615 is an apocalyptic number.

12155615 is a deficient number, since it is larger than the sum of its proper divisors (3065473).

12155615 is a wasteful number, since it uses less digits than its factorization.

12155615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105729.

The product of its digits is 1500, while the sum is 26.

The square root of 12155615 is about 3486.4903556442. The cubic root of 12155615 is about 229.9282384818.

The spelling of 12155615 in words is "twelve million, one hundred fifty-five thousand, six hundred fifteen".