1816812240 has 160 divisors (see below), whose sum is σ = 5729847552. Its totient is φ = 476160000.

The previous prime is 1816812229. The next prime is 1816812259. The reversal of 1816812240 is 422186181.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5841685 + ... + 5841995.

Almost surely, 2^1816812240 is an apocalyptic number.

1816812240 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 1816812240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2864923776).

1816812240 is an abundant number, since it is smaller than the sum of its proper divisors (3913035312).

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

1816812240 is a wasteful number, since it uses less digits than its factorization.

1816812240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 669 (or 663 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 1816812240 is about 42624.0805179420. The cubic root of 1816812240 is about 1220.2159073223.

It can be divided in two parts, 181681 and 2240, that added together give a triangular number (183921 = T₆₀₆).

The spelling of 1816812240 in words is "one billion, eight hundred sixteen million, eight hundred twelve thousand, two hundred forty".