47840 has 48 divisors (see below), whose sum is σ = 127008. Its totient is φ = 16896.

The previous prime is 47837. The next prime is 47843. The reversal of 47840 is 4874.

47840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (47837) and next prime (47843).

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47843) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2069 + ... + 2091.

It is equal to the Eulerian number A(10, 2).

It is an arithmetic number, because the mean of its divisors is an integer number (2646).

2⁴⁷⁸⁴⁰ is an apocalyptic number.

47840 is a gapful number since it is divisible by the number (40) 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 47840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63504).

47840 is an abundant number, since it is smaller than the sum of its proper divisors (79168).

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

47840 is a wasteful number, since it uses less digits than its factorization.

47840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51 (or 43 counting only the distinct ones).

The product of its (nonzero) digits is 896, while the sum is 23.

The square root of 47840 is about 218.7235698319. The cubic root of 47840 is about 36.3019864486.

47840 divided by its sum of digits (23) gives a triangular number (2080 = T₆₄).

The spelling of 47840 in words is "forty-seven thousand, eight hundred forty".