47286821 has 8 divisors (see below), whose sum is σ = 47944344. Its totient is φ = 46632960.

The previous prime is 47286803. The next prime is 47286823. The reversal of 47286821 is 12868274.

It can be written as a sum of positive squares in 4 ways, for example, as 4056196 + 43230625 = 2014^2 + 6575^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47286821 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 (47286823) 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 7 ways as a sum of consecutive naturals, for example, 33551 + ... + 34931.

It is an arithmetic number, because the mean of its divisors is an integer number (5993043).

Almost surely, 2^47286821 is an apocalyptic number.

It is an amenable number.

47286821 is a deficient number, since it is larger than the sum of its proper divisors (657523).

47286821 is a wasteful number, since it uses less digits than its factorization.

47286821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1831.

The product of its digits is 43008, while the sum is 38.

The square root of 47286821 is about 6876.5413544892. The cubic root of 47286821 is about 361.6152240773.

The spelling of 47286821 in words is "forty-seven million, two hundred eighty-six thousand, eight hundred twenty-one".