1861441500 has 96 divisors (see below), whose sum is σ = 5595512832. Its totient is φ = 480360000.

The previous prime is 1861441499. The next prime is 1861441511. The reversal of 1861441500 is 51441681.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26485 + ... + 66515.

It is an arithmetic number, because the mean of its divisors is an integer number (58286592).

Almost surely, 2^1861441500 is an apocalyptic number.

1861441500 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 1861441500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2797756416).

1861441500 is an abundant number, since it is smaller than the sum of its proper divisors (3734071332).

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

1861441500 is a wasteful number, since it uses less digits than its factorization.

1861441500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40084 (or 40072 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 30.

The square root of 1861441500 is about 43144.4260594576. The cubic root of 1861441500 is about 1230.1265650713.

The spelling of 1861441500 in words is "one billion, eight hundred sixty-one million, four hundred forty-one thousand, five hundred".