1323211992 has 64 divisors (see below), whose sum is σ = 3377933280. Its totient is φ = 431788032.

The previous prime is 1323211991. The next prime is 1323212069. The reversal of 1323211992 is 2991123231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323211991) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 778888 + ... + 780584.

Almost surely, 2^1323211992 is an apocalyptic number.

1323211992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1323211992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1688966640).

1323211992 is an abundant number, since it is smaller than the sum of its proper divisors (2054721288).

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

1323211992 is a wasteful number, since it uses less digits than its factorization.

1323211992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2372 (or 2368 counting only the distinct ones).

The product of its digits is 5832, while the sum is 33.

The square root of 1323211992 is about 36375.9809764630. The cubic root of 1323211992 is about 1097.8503450633.

The spelling of 1323211992 in words is "one billion, three hundred twenty-three million, two hundred eleven thousand, nine hundred ninety-two".