1816422144 has 72 divisors (see below), whose sum is σ = 4916392320. Its totient is φ = 595196928.

The previous prime is 1816422143. The next prime is 1816422169. The reversal of 1816422144 is 4412246181.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816422143) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25269 + ... + 65355.

Almost surely, 2^1816422144 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 1816422144, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2458196160).

1816422144 is an abundant number, since it is smaller than the sum of its proper divisors (3099970176).

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

1816422144 is an equidigital number, since it uses as much as digits as its factorization.

1816422144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40165 (or 40151 counting only the distinct ones).

The product of its digits is 12288, while the sum is 33.

The square root of 1816422144 is about 42619.5042674126. The cubic root of 1816422144 is about 1220.1285683729.

The spelling of 1816422144 in words is "one billion, eight hundred sixteen million, four hundred twenty-two thousand, one hundred forty-four".