1812517056 has 252 divisors, whose sum is σ = 6098133600. Its totient is φ = 513192960.

The previous prime is 1812517051. The next prime is 1812517079. The reversal of 1812517056 is 6507152181.

It is a tau number, because it is divible by the number of its divisors (252).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 1812517056.

It is not an unprimeable number, because it can be changed into a prime (1812517051) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4205161 + ... + 4205591.

Almost surely, 2^1812517056 is an apocalyptic number.

1812517056 is a gapful number since it is divisible by the number (16) 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 1812517056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3049066800).

1812517056 is an abundant number, since it is smaller than the sum of its proper divisors (4285616544).

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

1812517056 is a wasteful number, since it uses less digits than its factorization.

1812517056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612 (or 592 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 36.

The square root of 1812517056 is about 42573.6662269060. Note that the first 3 decimals coincide. The cubic root of 1812517056 is about 1219.2535647204.

The spelling of 1812517056 in words is "one billion, eight hundred twelve million, five hundred seventeen thousand, fifty-six".