1861019328 has 112 divisors (see below), whose sum is σ = 5680399104. Its totient is φ = 526709760.

The previous prime is 1861019299. The next prime is 1861019333. The reversal of 1861019328 is 8239101681.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 137338 + ... + 150278.

Almost surely, 2^1861019328 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1861019328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2840199552).

1861019328 is an abundant number, since it is smaller than the sum of its proper divisors (3819379776).

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

1861019328 is a wasteful number, since it uses less digits than its factorization.

1861019328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13070 (or 13060 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 1861019328 is about 43139.5332380868. The cubic root of 1861019328 is about 1230.0335611174.

The spelling of 1861019328 in words is "one billion, eight hundred sixty-one million, nineteen thousand, three hundred twenty-eight".