47891840 has 32 divisors (see below), whose sum is σ = 114492960. Its totient is φ = 19156480.

The previous prime is 47891821. The next prime is 47891849. The reversal of 47891840 is 4819874.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47891849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36776 + ... + 38055.

It is an arithmetic number, because the mean of its divisors is an integer number (3577905).

Almost surely, 2^47891840 is an apocalyptic number.

47891840 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

47891840 is an abundant number, since it is smaller than the sum of its proper divisors (66601120).

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

47891840 is an equidigital number, since it uses as much as digits as its factorization.

47891840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74850 (or 74838 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 47891840 is about 6920.3930524212. The cubic root of 47891840 is about 363.1509413836.

The spelling of 47891840 in words is "forty-seven million, eight hundred ninety-one thousand, eight hundred forty".