12811992 has 32 divisors (see below), whose sum is σ = 32140800. Its totient is φ = 4255904.

The previous prime is 12811991. The next prime is 12811993. The reversal of 12811992 is 29911821.

It is an interprime number because it is at equal distance from previous prime (12811991) and next prime (12811993).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12811991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7873 + ... + 9359.

It is an arithmetic number, because the mean of its divisors is an integer number (1004400).

Almost surely, 2^12811992 is an apocalyptic number.

12811992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

12811992 is an abundant number, since it is smaller than the sum of its proper divisors (19328808).

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

12811992 is a wasteful number, since it uses less digits than its factorization.

12811992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855 (or 1851 counting only the distinct ones).

The product of its digits is 2592, while the sum is 33.

The square root of 12811992 is about 3579.3843045976. The cubic root of 12811992 is about 233.9944479653.

The spelling of 12811992 in words is "twelve million, eight hundred eleven thousand, nine hundred ninety-two".