12811722 has 48 divisors (see below), whose sum is σ = 32200896. Its totient is φ = 3326400.

The previous prime is 12811717. The next prime is 12811741. The reversal of 12811722 is 22711821.

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 12811692 and 12811701.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3822 + ... + 6342.

It is an arithmetic number, because the mean of its divisors is an integer number (670852).

Almost surely, 2^12811722 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12811722, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16100448).

12811722 is an abundant number, since it is smaller than the sum of its proper divisors (19389174).

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

12811722 is a wasteful number, since it uses less digits than its factorization.

12811722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2555 (or 2544 counting only the distinct ones).

The product of its digits is 448, while the sum is 24.

The square root of 12811722 is about 3579.3465884153. The cubic root of 12811722 is about 233.9928042202.

Subtracting 12811722 from its reverse (22711821), we obtain a palindrome (9900099).

It can be divided in two parts, 1281 and 1722, that added together give a palindrome (3003).

The spelling of 12811722 in words is "twelve million, eight hundred eleven thousand, seven hundred twenty-two".