1916187840 has 560 divisors, whose sum is σ = 7966252800. Its totient is φ = 428156928.

The previous prime is 1916187821. The next prime is 1916187851. The reversal of 1916187840 is 487816191.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (560).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 10704871 + ... + 10705049.

Almost surely, 2^1916187840 is an apocalyptic number.

1916187840 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 1916187840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3983126400).

1916187840 is an abundant number, since it is smaller than the sum of its proper divisors (6050064960).

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

1916187840 is a wasteful number, since it uses less digits than its factorization.

1916187840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 255 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The square root of 1916187840 is about 43774.2828610590. The cubic root of 1916187840 is about 1242.0698693453.

The spelling of 1916187840 in words is "one billion, nine hundred sixteen million, one hundred eighty-seven thousand, eight hundred forty".