1816722432 has 396 divisors, whose sum is σ = 6370673400. Its totient is φ = 515579904.

The previous prime is 1816722431. The next prime is 1816722461. The reversal of 1816722432 is 2342276181.

It is a happy number.

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

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816722431) 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, 12192694 + ... + 12192842.

Almost surely, 2^1816722432 is an apocalyptic number.

1816722432 is a gapful number since it is divisible by the number (12) 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 1816722432, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3185336700).

1816722432 is an abundant number, since it is smaller than the sum of its proper divisors (4553950968).

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

1816722432 is an equidigital number, since it uses as much as digits as its factorization.

1816722432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198 (or 161 counting only the distinct ones).

The product of its digits is 32256, while the sum is 36.

The square root of 1816722432 is about 42623.0270159218. The cubic root of 1816722432 is about 1220.1958012351.

The spelling of 1816722432 in words is "one billion, eight hundred sixteen million, seven hundred twenty-two thousand, four hundred thirty-two".