12642155 has 8 divisors (see below), whose sum is σ = 15287184. Its totient is φ = 10036000.

The previous prime is 12642139. The next prime is 12642181. The reversal of 12642155 is 55124621.

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

It is not a de Polignac number, because 12642155 - 2⁴ = 12642139 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8996 + ... + 10305.

It is an arithmetic number, because the mean of its divisors is an integer number (1910898).

Almost surely, 2^12642155 is an apocalyptic number.

12642155 is a deficient number, since it is larger than the sum of its proper divisors (2645029).

12642155 is a wasteful number, since it uses less digits than its factorization.

12642155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19437.

The product of its digits is 2400, while the sum is 26.

The square root of 12642155 is about 3555.5808245630. The cubic root of 12642155 is about 232.9558943206.

Adding to 12642155 its reverse (55124621), we get a palindrome (67766776).

The spelling of 12642155 in words is "twelve million, six hundred forty-two thousand, one hundred fifty-five".