12811388 has 24 divisors (see below), whose sum is σ = 23360400. Its totient is φ = 6140288.

The previous prime is 12811373. The next prime is 12811397. The reversal of 12811388 is 88311821.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20456 + ... + 21072.

It is an arithmetic number, because the mean of its divisors is an integer number (973350).

Almost surely, 2^12811388 is an apocalyptic number.

It is an amenable number.

12811388 is a deficient number, since it is larger than the sum of its proper divisors (10549012).

12811388 is a wasteful number, since it uses less digits than its factorization.

12811388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829 (or 827 counting only the distinct ones).

The product of its digits is 3072, while the sum is 32.

The square root of 12811388 is about 3579.2999315509. The cubic root of 12811388 is about 233.9907708148.

The spelling of 12811388 in words is "twelve million, eight hundred eleven thousand, three hundred eighty-eight".