1851120138 has 96 divisors (see below), whose sum is σ = 4444632000. Its totient is φ = 512096256.

The previous prime is 1851120137. The next prime is 1851120149. The reversal of 1851120138 is 8310211581.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1851120137) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4122538 + ... + 4122986.

It is an arithmetic number, because the mean of its divisors is an integer number (46298250).

Almost surely, 2^1851120138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1851120138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2222316000).

1851120138 is an abundant number, since it is smaller than the sum of its proper divisors (2593511862).

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

1851120138 is a wasteful number, since it uses less digits than its factorization.

1851120138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 884 (or 877 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 30.

The square root of 1851120138 is about 43024.6457045261. The cubic root of 1851120138 is about 1227.8487388270.

The spelling of 1851120138 in words is "one billion, eight hundred fifty-one million, one hundred twenty thousand, one hundred thirty-eight".