12791988 has 36 divisors (see below), whose sum is σ = 35275968. Its totient is φ = 3876240.

The previous prime is 12791983. The next prime is 12792011. The reversal of 12791988 is 88919721.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12791981) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15756 + ... + 16547.

It is an arithmetic number, because the mean of its divisors is an integer number (979888).

Almost surely, 2^12791988 is an apocalyptic number.

12791988 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

12791988 is an abundant number, since it is smaller than the sum of its proper divisors (22483980).

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

12791988 is a wasteful number, since it uses less digits than its factorization.

12791988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32324 (or 32319 counting only the distinct ones).

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

The square root of 12791988 is about 3576.5888776878. The cubic root of 12791988 is about 233.8726021408.

The spelling of 12791988 in words is "twelve million, seven hundred ninety-one thousand, nine hundred eighty-eight".