18409729350 has 96 divisors (see below), whose sum is σ = 46022411520. Its totient is φ = 4870023040.

The previous prime is 18409729339. The next prime is 18409729381. The reversal of 18409729350 is 5392790481.

It is a self number, because there is not a number n which added to its sum of digits gives 18409729350.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20754607 + ... + 20755493.

It is an arithmetic number, because the mean of its divisors is an integer number (479400120).

Almost surely, 2^18409729350 is an apocalyptic number.

18409729350 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18409729350, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23011205760).

18409729350 is an abundant number, since it is smaller than the sum of its proper divisors (27612682170).

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

18409729350 is a wasteful number, since it uses less digits than its factorization.

18409729350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854 (or 1849 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 48.

The spelling of 18409729350 in words is "eighteen billion, four hundred nine million, seven hundred twenty-nine thousand, three hundred fifty".