47021647 has 4 divisors (see below), whose sum is σ = 47036080. Its totient is φ = 47007216.

The previous prime is 47021641. The next prime is 47021651. The reversal of 47021647 is 74612074.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 74612074 = 2 ⋅37306037.

It is a cyclic number.

It is not a de Polignac number, because 47021647 - 2²³ = 38633039 is a prime.

It is a super-2 number, since 2×47021647² = 4422070573185218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47021641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 238 + ... + 9700.

It is an arithmetic number, because the mean of its divisors is an integer number (11759020).

Almost surely, 2^47021647 is an apocalyptic number.

47021647 is a deficient number, since it is larger than the sum of its proper divisors (14433).

47021647 is an equidigital number, since it uses as much as digits as its factorization.

47021647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14432.

The product of its (nonzero) digits is 9408, while the sum is 31.

The square root of 47021647 is about 6857.2331883931. The cubic root of 47021647 is about 360.9380039485.

The spelling of 47021647 in words is "forty-seven million, twenty-one thousand, six hundred forty-seven".