47804021 has 4 divisors (see below), whose sum is σ = 48242700. Its totient is φ = 47365344.

The previous prime is 47804011. The next prime is 47804023. The reversal of 47804021 is 12040874.

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 33477796 + 14326225 = 5786^2 + 3785^2 .

It is a cyclic number.

It is not a de Polignac number, because 47804021 - 2¹⁴ = 47787637 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 (47804023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 219176 + ... + 219393.

It is an arithmetic number, because the mean of its divisors is an integer number (12060675).

Almost surely, 2^47804021 is an apocalyptic number.

It is an amenable number.

47804021 is a deficient number, since it is larger than the sum of its proper divisors (438679).

47804021 is a wasteful number, since it uses less digits than its factorization.

47804021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438678.

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 47804021 is about 6914.0451980010. The cubic root of 47804021 is about 362.9288362851.

Adding to 47804021 its reverse (12040874), we get a palindrome (59844895).

The spelling of 47804021 in words is "forty-seven million, eight hundred four thousand, twenty-one".