1863871880 has 96 divisors (see below), whose sum is σ = 4766995800. Its totient is φ = 651912192.

The previous prime is 1863871879. The next prime is 1863871883. The reversal of 1863871880 is 881783681.

It can be written as a sum of positive squares in 4 ways, for example, as 876278404 + 987593476 = 29602^2 + 31426^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1863871883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 182756 + ... + 192684.

Almost surely, 2^1863871880 is an apocalyptic number.

1863871880 is a gapful number since it is divisible by the number (10) 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 1863871880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2383497900).

1863871880 is an abundant number, since it is smaller than the sum of its proper divisors (2903123920).

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

1863871880 is a wasteful number, since it uses less digits than its factorization.

1863871880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9991 (or 9968 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 50.

The square root of 1863871880 is about 43172.5825032508. The cubic root of 1863871880 is about 1230.6617013789.

The spelling of 1863871880 in words is "one billion, eight hundred sixty-three million, eight hundred seventy-one thousand, eight hundred eighty".