1861800000 has 336 divisors, whose sum is σ = 6428963520. Its totient is φ = 474880000.

The previous prime is 1861799993. The next prime is 1861800019. The reversal of 1861800000 is 81681.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 17399947 + ... + 17400053.

It is an arithmetic number, because the mean of its divisors is an integer number (19133820).

Almost surely, 2^1861800000 is an apocalyptic number.

1861800000 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 1861800000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3214481760).

1861800000 is an abundant number, since it is smaller than the sum of its proper divisors (4567163520).

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

1861800000 is an equidigital number, since it uses as much as digits as its factorization.

1861800000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 146 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 24.

The square root of 1861800000 is about 43148.5805096761. The cubic root of 1861800000 is about 1230.2055311244.

Adding to 1861800000 its reverse (81681), we get a palindrome (1861881681).

The spelling of 1861800000 in words is "one billion, eight hundred sixty-one million, eight hundred thousand".