47808138 has 64 divisors (see below), whose sum is σ = 114573312. Its totient is φ = 13011840.

The previous prime is 47808133. The next prime is 47808139. The reversal of 47808138 is 83180874.

It is a junction number, because it is equal to n+sod(n) for n = 47808096 and 47808105.

It is not an unprimeable number, because it can be changed into a prime (47808133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 94795 + ... + 95297.

It is an arithmetic number, because the mean of its divisors is an integer number (1790208).

Almost surely, 2^47808138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 47808138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57286656).

47808138 is an abundant number, since it is smaller than the sum of its proper divisors (66765174).

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

47808138 is a wasteful number, since it uses less digits than its factorization.

47808138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619.

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 47808138 is about 6914.3429188897. The cubic root of 47808138 is about 362.9392547611.

The spelling of 47808138 in words is "forty-seven million, eight hundred eight thousand, one hundred thirty-eight".