47438647 has 4 divisors (see below), whose sum is σ = 47456640. Its totient is φ = 47420656.

The previous prime is 47438641. The next prime is 47438659. The reversal of 47438647 is 74683474.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74683474 = 2 ⋅37341737.

It is a cyclic number.

It is not a de Polignac number, because 47438647 - 2³ = 47438639 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 (47438641) 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, 4183 + ... + 10600.

It is an arithmetic number, because the mean of its divisors is an integer number (11864160).

Almost surely, 2^47438647 is an apocalyptic number.

47438647 is a deficient number, since it is larger than the sum of its proper divisors (17993).

47438647 is a wasteful number, since it uses less digits than its factorization.

47438647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17992.

The product of its digits is 451584, while the sum is 43.

The square root of 47438647 is about 6887.5719233994. The cubic root of 47438647 is about 362.0018288930.

The spelling of 47438647 in words is "forty-seven million, four hundred thirty-eight thousand, six hundred forty-seven".