1838161992 has 128 divisors (see below), whose sum is σ = 5209920000. Its totient is φ = 536933376.

The previous prime is 1838161991. The next prime is 1838162023. The reversal of 1838161992 is 2991618381.

It is not an unprimeable number, because it can be changed into a prime (1838161991) 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, 455359 + ... + 459377.

It is an arithmetic number, because the mean of its divisors is an integer number (40702500).

Almost surely, 2^1838161992 is an apocalyptic number.

1838161992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1838161992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2604960000).

1838161992 is an abundant number, since it is smaller than the sum of its proper divisors (3371758008).

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

1838161992 is a wasteful number, since it uses less digits than its factorization.

1838161992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4123 (or 4119 counting only the distinct ones).

The product of its digits is 186624, while the sum is 48.

The square root of 1838161992 is about 42873.7914348615. The cubic root of 1838161992 is about 1224.9769796035.

The spelling of 1838161992 in words is "one billion, eight hundred thirty-eight million, one hundred sixty-one thousand, nine hundred ninety-two".