1866978240 has 112 divisors (see below), whose sum is σ = 6132149280. Its totient is φ = 480686080.

The previous prime is 1866978229. The next prime is 1866978283. The reversal of 1866978240 is 428796681.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 5691 + ... + 61370.

Almost surely, 2^1866978240 is an apocalyptic number.

1866978240 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 1866978240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3066074640).

1866978240 is an abundant number, since it is smaller than the sum of its proper divisors (4265171040).

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

1866978240 is a wasteful number, since it uses less digits than its factorization.

1866978240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67110 (or 67100 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 51.

The square root of 1866978240 is about 43208.5435996170. The cubic root of 1866978240 is about 1231.3450023666.

The spelling of 1866978240 in words is "one billion, eight hundred sixty-six million, nine hundred seventy-eight thousand, two hundred forty".