1869488640 has 640 divisors, whose sum is σ = 7389169920. Its totient is φ = 445906944.

The previous prime is 1869488639. The next prime is 1869488651. The reversal of 1869488640 is 468849681.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (54).

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 63 ways as a sum of consecutive naturals, for example, 43476459 + ... + 43476501.

It is an arithmetic number, because the mean of its divisors is an integer number (11545578).

Almost surely, 2^1869488640 is an apocalyptic number.

1869488640 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 1869488640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3694584960).

1869488640 is an abundant number, since it is smaller than the sum of its proper divisors (5519681280).

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

1869488640 is a wasteful number, since it uses less digits than its factorization.

1869488640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 2654208, while the sum is 54.

The square root of 1869488640 is about 43237.5836512634. The cubic root of 1869488640 is about 1231.8966574361.

The spelling of 1869488640 in words is "one billion, eight hundred sixty-nine million, four hundred eighty-eight thousand, six hundred forty".