1321999060 has 24 divisors (see below), whose sum is σ = 2896903296. Its totient is φ = 505808160.

The previous prime is 1321999057. The next prime is 1321999079. The reversal of 1321999060 is 609991231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1436496 + ... + 1437415.

It is an arithmetic number, because the mean of its divisors is an integer number (120704304).

Almost surely, 2^1321999060 is an apocalyptic number.

1321999060 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1321999060 is an abundant number, since it is smaller than the sum of its proper divisors (1574904236).

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

1321999060 is a wasteful number, since it uses less digits than its factorization.

1321999060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2873943 (or 2873941 counting only the distinct ones).

The product of its (nonzero) digits is 26244, while the sum is 40.

The square root of 1321999060 is about 36359.3049988583. The cubic root of 1321999060 is about 1097.5147916500.

The spelling of 1321999060 in words is "one billion, three hundred twenty-one million, nine hundred ninety-nine thousand, sixty".