1899344040 has 256 divisors, whose sum is σ = 6710065920. Its totient is φ = 424919040.

The previous prime is 1899344039. The next prime is 1899344047. The reversal of 1899344040 is 404439981.

It is a junction number, because it is equal to n+sod(n) for n = 1899343983 and 1899344001.

It is not an unprimeable number, because it can be changed into a prime (1899344047) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1188522 + ... + 1190118.

It is an arithmetic number, because the mean of its divisors is an integer number (26211195).

Almost surely, 2^1899344040 is an apocalyptic number.

1899344040 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 1899344040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3355032960).

1899344040 is an abundant number, since it is smaller than the sum of its proper divisors (4810721880).

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

1899344040 is a wasteful number, since it uses less digits than its factorization.

1899344040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1692 (or 1688 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 1899344040 is about 43581.4644086222. The cubic root of 1899344040 is about 1238.4197786020.

The spelling of 1899344040 in words is "one billion, eight hundred ninety-nine million, three hundred forty-four thousand, forty".