1321555340 has 48 divisors (see below), whose sum is σ = 3199839552. Its totient is φ = 449089536.

The previous prime is 1321555331. The next prime is 1321555357. The reversal of 1321555340 is 435551231.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25949 + ... + 57588.

It is an arithmetic number, because the mean of its divisors is an integer number (66663324).

Almost surely, 2^1321555340 is an apocalyptic number.

1321555340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321555340 is an abundant number, since it is smaller than the sum of its proper divisors (1878284212).

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

1321555340 is a wasteful number, since it uses less digits than its factorization.

1321555340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83666 (or 83664 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 1321555340 is about 36353.2026099490. The cubic root of 1321555340 is about 1097.3919867825.

The spelling of 1321555340 in words is "one billion, three hundred twenty-one million, five hundred fifty-five thousand, three hundred forty".