1816211968 has 40 divisors (see below), whose sum is σ = 3678662988. Its totient is φ = 895647744.

The previous prime is 1816211939. The next prime is 1816211981. The reversal of 1816211968 is 8691126181.

It can be written as a sum of positive squares in 2 ways, for example, as 1801832704 + 14379264 = 42448^2 + 3792^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13080 + ... + 61672.

Almost surely, 2^1816211968 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1816211968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1839331494).

1816211968 is an abundant number, since it is smaller than the sum of its proper divisors (1862451020).

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

1816211968 is an frugal number, since it uses more digits than its factorization.

1816211968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48684 (or 48668 counting only the distinct ones).

The product of its digits is 41472, while the sum is 43.

The square root of 1816211968 is about 42617.0384705460. The cubic root of 1816211968 is about 1220.0815066928.

The spelling of 1816211968 in words is "one billion, eight hundred sixteen million, two hundred eleven thousand, nine hundred sixty-eight".