1861200 has 180 divisors, whose sum is σ = 7195968. Its totient is φ = 441600.

The previous prime is 1861187. The next prime is 1861219. The reversal of 1861200 is 21681.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 39577 + ... + 39623.

2^1861200 is an apocalyptic number.

1861200 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 1861200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3597984).

1861200 is an abundant number, since it is smaller than the sum of its proper divisors (5334768).

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

1861200 is a wasteful number, since it uses less digits than its factorization.

1861200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82 (or 68 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 1861200 is about 1364.2580401082. The cubic root of 1861200 is about 123.0073364650.

Adding to 1861200 its reverse (21681), we get a palindrome (1882881).

The spelling of 1861200 in words is "one million, eight hundred sixty-one thousand, two hundred".