47981389 has 4 divisors (see below), whose sum is σ = 48021660. Its totient is φ = 47941120.

The previous prime is 47981369. The next prime is 47981419. The reversal of 47981389 is 98318974.

It is a happy number.

47981389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 46376100 + 1605289 = 6810^2 + 1267^2 .

It is a cyclic number.

It is not a de Polignac number, because 47981389 - 2¹⁷ = 47850317 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47981309) 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 3 ways as a sum of consecutive naturals, for example, 18292 + ... + 20749.

It is an arithmetic number, because the mean of its divisors is an integer number (12005415).

Almost surely, 2^47981389 is an apocalyptic number.

It is an amenable number.

47981389 is a deficient number, since it is larger than the sum of its proper divisors (40271).

47981389 is a wasteful number, since it uses less digits than its factorization.

47981389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40270.

The product of its digits is 435456, while the sum is 49.

The square root of 47981389 is about 6926.8599668248. The cubic root of 47981389 is about 363.3771424510.

The spelling of 47981389 in words is "forty-seven million, nine hundred eighty-one thousand, three hundred eighty-nine".