1866122240 has 88 divisors (see below), whose sum is σ = 4712357760. Its totient is φ = 707125248.

The previous prime is 1866122239. The next prime is 1866122267. The reversal of 1866122240 is 422216681.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 1866122197 and 1866122206.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87689 + ... + 106871.

It is an arithmetic number, because the mean of its divisors is an integer number (53549520).

Almost surely, 2^1866122240 is an apocalyptic number.

1866122240 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 1866122240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2356178880).

1866122240 is an abundant number, since it is smaller than the sum of its proper divisors (2846235520).

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

1866122240 is a wasteful number, since it uses less digits than its factorization.

1866122240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19227 (or 19209 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 1866122240 is about 43198.6370155356. The cubic root of 1866122240 is about 1231.1567851305.

The spelling of 1866122240 in words is "one billion, eight hundred sixty-six million, one hundred twenty-two thousand, two hundred forty".