1729421799940 has 12 divisors (see below), whose sum is σ = 3631785779916. Its totient is φ = 691768719968.

The previous prime is 1729421799901. The next prime is 1729421799977. The reversal of 1729421799940 is 499971249271.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 952404231744 + 777017568196 = 975912^2 + 881486^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43235544979 + ... + 43235545018.

It is an arithmetic number, because the mean of its divisors is an integer number (302648814993).

Almost surely, 2^{1729421799940} is an apocalyptic number.

1729421799940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1729421799940 is an abundant number, since it is smaller than the sum of its proper divisors (1902363979976).

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

1729421799940 is a wasteful number, since it uses less digits than its factorization.

1729421799940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86471090006 (or 86471090004 counting only the distinct ones).

The product of its (nonzero) digits is 20575296, while the sum is 64.

The spelling of 1729421799940 in words is "one trillion, seven hundred twenty-nine billion, four hundred twenty-one million, seven hundred ninety-nine thousand, nine hundred forty".