1838391161979 has 32 divisors (see below), whose sum is σ = 2696162236416. Its totient is φ = 1109180367360.

The previous prime is 1838391161951. The next prime is 1838391162017. The reversal of 1838391161979 is 9791611938381.

It is a happy number.

It is not a de Polignac number, because 1838391161979 - 2⁵ = 1838391161947 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1838391161939) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3454977 + ... + 3951410.

It is an arithmetic number, because the mean of its divisors is an integer number (84255069888).

Almost surely, 2^{1838391161979} is an apocalyptic number.

1838391161979 is a deficient number, since it is larger than the sum of its proper divisors (857771074437).

1838391161979 is a wasteful number, since it uses less digits than its factorization.

1838391161979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7406595.

The product of its digits is 17635968, while the sum is 66.

The spelling of 1838391161979 in words is "one trillion, eight hundred thirty-eight billion, three hundred ninety-one million, one hundred sixty-one thousand, nine hundred seventy-nine".