1869987840 has 240 divisors, whose sum is σ = 6844895232. Its totient is φ = 427032576.

The previous prime is 1869987839. The next prime is 1869987851. The reversal of 1869987840 is 487899681.

It is a tau number, because it is divible by the number of its divisors (240).

It is a Harshad number since it is a multiple of its sum of digits (60).

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 1719777 + ... + 1720863.

Almost surely, 2^1869987840 is an apocalyptic number.

1869987840 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 1869987840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3422447616).

1869987840 is an abundant number, since it is smaller than the sum of its proper divisors (4974907392).

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

1869987840 is an equidigital number, since it uses as much as digits as its factorization.

1869987840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1130 (or 1104 counting only the distinct ones).

The product of its (nonzero) digits is 6967296, while the sum is 60.

The square root of 1869987840 is about 43243.3560214746. The cubic root of 1869987840 is about 1232.0062967014.

The spelling of 1869987840 in words is "one billion, eight hundred sixty-nine million, nine hundred eighty-seven thousand, eight hundred forty".