12917955 has 16 divisors (see below), whose sum is σ = 21060000. Its totient is φ = 6759168.

The previous prime is 12917939. The next prime is 12917959. The reversal of 12917955 is 55971921.

It is not a de Polignac number, because 12917955 - 2⁴ = 12917939 is a prime.

It is a super-2 number, since 2×12917955² = 333747122764050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12917959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7330 + ... + 8919.

It is an arithmetic number, because the mean of its divisors is an integer number (1316250).

Almost surely, 2^12917955 is an apocalyptic number.

12917955 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

12917955 is a deficient number, since it is larger than the sum of its proper divisors (8142045).

12917955 is a wasteful number, since it uses less digits than its factorization.

12917955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16310.

The product of its digits is 28350, while the sum is 39.

The square root of 12917955 is about 3594.1556727554. The cubic root of 12917955 is about 234.6377699959.

The spelling of 12917955 in words is "twelve million, nine hundred seventeen thousand, nine hundred fifty-five".