1851813834 has 64 divisors (see below), whose sum is σ = 4296230400. Its totient is φ = 527228352.

The previous prime is 1851813827. The next prime is 1851813839. The reversal of 1851813834 is 4383181581.

It is not an unprimeable number, because it can be changed into a prime (1851813839) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 49197 + ... + 78255.

It is an arithmetic number, because the mean of its divisors is an integer number (67128600).

Almost surely, 2^1851813834 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1851813834, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2148115200).

1851813834 is an abundant number, since it is smaller than the sum of its proper divisors (2444416566).

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

1851813834 is a wasteful number, since it uses less digits than its factorization.

1851813834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29139.

The product of its digits is 92160, while the sum is 42.

The square root of 1851813834 is about 43032.7065614051. The cubic root of 1851813834 is about 1228.0020959515.

The spelling of 1851813834 in words is "one billion, eight hundred fifty-one million, eight hundred thirteen thousand, eight hundred thirty-four".