47181312 has 80 divisors (see below), whose sum is σ = 139700880. Its totient is φ = 15722496.

The previous prime is 47181311. The next prime is 47181361. The reversal of 47181312 is 21318174.

47181312 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47181311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12118 + ... + 15530.

It is an arithmetic number, because the mean of its divisors is an integer number (1746261).

Almost surely, 2^47181312 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 47181312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69850440).

47181312 is an abundant number, since it is smaller than the sum of its proper divisors (92519568).

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

47181312 is an equidigital number, since it uses as much as digits as its factorization.

47181312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3440 (or 3418 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 47181312 is about 6868.8654084936. The cubic root of 47181312 is about 361.3460717570.

Adding to 47181312 its reverse (21318174), we get a palindrome (68499486).

The spelling of 47181312 in words is "forty-seven million, one hundred eighty-one thousand, three hundred twelve".