1023729017540 has 24 divisors (see below), whose sum is σ = 2154818961792. Its totient is φ = 408541507040.

The previous prime is 1023729017537. The next prime is 1023729017569. The reversal of 1023729017540 is 457109273201.

It is a happy number.

It is a super-2 number, since 2×1023729017540² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59372414 + ... + 59389653.

It is an arithmetic number, because the mean of its divisors is an integer number (89784123408).

Almost surely, 2^{1023729017540} is an apocalyptic number.

1023729017540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1023729017540 is an abundant number, since it is smaller than the sum of its proper divisors (1131089944252).

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

1023729017540 is a wasteful number, since it uses less digits than its factorization.

1023729017540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 118762507 (or 118762505 counting only the distinct ones).

The product of its (nonzero) digits is 105840, while the sum is 41.

The spelling of 1023729017540 in words is "one trillion, twenty-three billion, seven hundred twenty-nine million, seventeen thousand, five hundred forty".