12917988 has 24 divisors (see below), whose sum is σ = 33491360. Its totient is φ = 4305960.

The previous prime is 12917987. The next prime is 12917999. The reversal of 12917988 is 88971921.

It is not an unprimeable number, because it can be changed into a prime (12917981) 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 7 ways as a sum of consecutive naturals, for example, 59698 + ... + 59913.

Almost surely, 2^12917988 is an apocalyptic number.

12917988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12917988 is an abundant number, since it is smaller than the sum of its proper divisors (20573372).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12917988 is a wasteful number, since it uses less digits than its factorization.

12917988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119624 (or 119616 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 12917988 is about 3594.1602635386. The cubic root of 12917988 is about 234.6379697964.

The spelling of 12917988 in words is "twelve million, nine hundred seventeen thousand, nine hundred eighty-eight".