1816734140 has 48 divisors (see below), whose sum is σ = 4118149728. Its totient is φ = 669237504.

The previous prime is 1816734107. The next prime is 1816734163. The reversal of 1816734140 is 414376181.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1816734140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 107294 + ... + 123066.

It is an arithmetic number, because the mean of its divisors is an integer number (85794786).

Almost surely, 2^1816734140 is an apocalyptic number.

1816734140 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 1816734140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2059074864).

1816734140 is an abundant number, since it is smaller than the sum of its proper divisors (2301415588).

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

1816734140 is a wasteful number, since it uses less digits than its factorization.

1816734140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16238 (or 16236 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1816734140 is about 42623.1643593012. The cubic root of 1816734140 is about 1220.1984224430.

The spelling of 1816734140 in words is "one billion, eight hundred sixteen million, seven hundred thirty-four thousand, one hundred forty".