1866225600 has 378 divisors, whose sum is σ = 7019985960. Its totient is φ = 470154240.

The previous prime is 1866225587. The next prime is 1866225601. The reversal of 1866225600 is 65226681.

1866225600 is a `hidden beast` number, since 18 + 66 + 22 + 560 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1866225601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 53 ways as a sum of consecutive naturals, for example, 5198221 + ... + 5198579.

Almost surely, 2^1866225600 is an apocalyptic number.

1866225600 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 1866225600, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3509992980).

1866225600 is an abundant number, since it is smaller than the sum of its proper divisors (5153760360).

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

1866225600 is a wasteful number, since it uses less digits than its factorization.

1866225600 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425 (or 388 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The square root of 1866225600 is about 43199.8333330118. The cubic root of 1866225600 is about 1231.1795149770.

The spelling of 1866225600 in words is "one billion, eight hundred sixty-six million, two hundred twenty-five thousand, six hundred".