1816511472 has 120 divisors (see below), whose sum is σ = 5406841440. Its totient is φ = 567336960.

The previous prime is 1816511471. The next prime is 1816511491. The reversal of 1816511472 is 2741156181.

1816511472 is a `hidden beast` number, since 18 + 165 + 11 + 472 = 666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1816511471) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 588429 + ... + 591507.

It is an arithmetic number, because the mean of its divisors is an integer number (45057012).

Almost surely, 2^1816511472 is an apocalyptic number.

1816511472 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 1816511472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2703420720).

1816511472 is an abundant number, since it is smaller than the sum of its proper divisors (3590329968).

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

1816511472 is a wasteful number, since it uses less digits than its factorization.

1816511472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351 (or 3342 counting only the distinct ones).

The product of its digits is 13440, while the sum is 36.

The square root of 1816511472 is about 42620.5522254229. The cubic root of 1816511472 is about 1220.1485692041.

The spelling of 1816511472 in words is "one billion, eight hundred sixteen million, five hundred eleven thousand, four hundred seventy-two".