1887218340 has 144 divisors (see below), whose sum is σ = 6234205824. Its totient is φ = 425241600.

The previous prime is 1887218317. The next prime is 1887218351. The reversal of 1887218340 is 438127881.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 1887218292 and 1887218301.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 204220 + ... + 213260.

It is an arithmetic number, because the mean of its divisors is an integer number (43293096).

Almost surely, 2^1887218340 is an apocalyptic number.

1887218340 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 1887218340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3117102912).

1887218340 is an abundant number, since it is smaller than the sum of its proper divisors (4346987484).

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

1887218340 is a wasteful number, since it uses less digits than its factorization.

1887218340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9138 (or 9129 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 42.

The square root of 1887218340 is about 43442.1263291750. The cubic root of 1887218340 is about 1235.7787305124.

The spelling of 1887218340 in words is "one billion, eight hundred eighty-seven million, two hundred eighteen thousand, three hundred forty".