1321738992 has 80 divisors (see below), whose sum is σ = 4335873280. Its totient is φ = 377638848.

The previous prime is 1321738991. The next prime is 1321738993. The reversal of 1321738992 is 2998371231.

It is an interprime number because it is at equal distance from previous prime (1321738991) and next prime (1321738993).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321738991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 215518 + ... + 221565.

It is an arithmetic number, because the mean of its divisors is an integer number (54198416).

Almost surely, 2^1321738992 is an apocalyptic number.

1321738992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1321738992 is an abundant number, since it is smaller than the sum of its proper divisors (3014134288).

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

1321738992 is a wasteful number, since it uses less digits than its factorization.

1321738992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437107 (or 437095 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 1321738992 is about 36355.7284619632. The cubic root of 1321738992 is about 1097.4428180245.

The spelling of 1321738992 in words is "one billion, three hundred twenty-one million, seven hundred thirty-eight thousand, nine hundred ninety-two".