1321187392 has 84 divisors (see below), whose sum is σ = 3107702700. Its totient is φ = 555469824.

The previous prime is 1321187381. The next prime is 1321187411. The reversal of 1321187392 is 2937811231.

It can be written as a sum of positive squares in 2 ways, for example, as 796594176 + 524593216 = 28224^2 + 22904^2 .

It is a super-2 number, since 2×1321187392² = 3491072249559523328, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 162234 + ... + 170182.

Almost surely, 2^1321187392 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321187392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1553851350).

1321187392 is an abundant number, since it is smaller than the sum of its proper divisors (1786515308).

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

1321187392 is an equidigital number, since it uses as much as digits as its factorization.

1321187392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8028 (or 8011 counting only the distinct ones).

The product of its digits is 18144, while the sum is 37.

The square root of 1321187392 is about 36348.1415205785. The cubic root of 1321187392 is about 1097.2901318811.

The spelling of 1321187392 in words is "one billion, three hundred twenty-one million, one hundred eighty-seven thousand, three hundred ninety-two".