2389434865818 has 256 divisors, whose sum is σ = 6521702584320. Its totient is φ = 563554252800.

The previous prime is 2389434865817. The next prime is 2389434865859. The reversal of 2389434865818 is 8185684349832.

It is not an unprimeable number, because it can be changed into a prime (2389434865817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 105291853 + ... + 105314543.

It is an arithmetic number, because the mean of its divisors is an integer number (25475400720).

Almost surely, 2^{2389434865818} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2389434865818, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3260851292160).

2389434865818 is an abundant number, since it is smaller than the sum of its proper divisors (4132267718502).

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

2389434865818 is a wasteful number, since it uses less digits than its factorization.

2389434865818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23013.

The product of its digits is 318504960, while the sum is 69.

The spelling of 2389434865818 in words is "two trillion, three hundred eighty-nine billion, four hundred thirty-four million, eight hundred sixty-five thousand, eight hundred eighteen".