1838779782749 has 16 divisors (see below), whose sum is σ = 2264216153472. Its totient is φ = 1454149931328.

The previous prime is 1838779782713. The next prime is 1838779782773. The reversal of 1838779782749 is 9472879778381.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1838779782749 is a prime.

It is a super-2 number, since 2×1838779782749² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1838779782649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4734359 + ... + 5108004.

It is an arithmetic number, because the mean of its divisors is an integer number (141513509592).

Almost surely, 2^{1838779782749} is an apocalyptic number.

It is an amenable number.

1838779782749 is a deficient number, since it is larger than the sum of its proper divisors (425436370723).

1838779782749 is a wasteful number, since it uses less digits than its factorization.

1838779782749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9844436.

The product of its digits is 2389782528, while the sum is 80.

The spelling of 1838779782749 in words is "one trillion, eight hundred thirty-eight billion, seven hundred seventy-nine million, seven hundred eighty-two thousand, seven hundred forty-nine".