1861241500 has 48 divisors (see below), whose sum is σ = 4075527456. Its totient is φ = 742560000.

The previous prime is 1861241483. The next prime is 1861241509. The reversal of 1861241500 is 51421681.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1861241509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195859 + ... + 205141.

It is an arithmetic number, because the mean of its divisors is an integer number (84906822).

Almost surely, 2^1861241500 is an apocalyptic number.

1861241500 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 1861241500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2037763728).

1861241500 is an abundant number, since it is smaller than the sum of its proper divisors (2214285956).

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

1861241500 is a wasteful number, since it uses less digits than its factorization.

1861241500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9703 (or 9691 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 1861241500 is about 43142.1082006895. The cubic root of 1861241500 is about 1230.0825070791.

The spelling of 1861241500 in words is "one billion, eight hundred sixty-one million, two hundred forty-one thousand, five hundred".