1729987140 has 144 divisors (see below), whose sum is σ = 5667689664. Its totient is φ = 393120000.

The previous prime is 1729987123. The next prime is 1729987163. The reversal of 1729987140 is 417899271.

It is a self number, because there is not a number n which added to its sum of digits gives 1729987140.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 530515 + ... + 533765.

It is an arithmetic number, because the mean of its divisors is an integer number (39358956).

Almost surely, 2^1729987140 is an apocalyptic number.

1729987140 is a gapful number since it is divisible by the number (10) 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 1729987140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2833844832).

1729987140 is an abundant number, since it is smaller than the sum of its proper divisors (3937702524).

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

1729987140 is a wasteful number, since it uses less digits than its factorization.

1729987140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3458 (or 3449 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 48.

The square root of 1729987140 is about 41593.1140935612. The cubic root of 1729987140 is about 1200.4598099010.

The spelling of 1729987140 in words is "one billion, seven hundred twenty-nine million, nine hundred eighty-seven thousand, one hundred forty".