47873218 has 4 divisors (see below), whose sum is σ = 71809830. Its totient is φ = 23936608.

The previous prime is 47873201. The next prime is 47873219. The reversal of 47873218 is 81237874.

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

It can be written as a sum of positive squares in only one way, i.e., 34963569 + 12909649 = 5913^2 + 3593^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (47873219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11968303 + ... + 11968306.

Almost surely, 2^47873218 is an apocalyptic number.

47873218 is a deficient number, since it is larger than the sum of its proper divisors (23936612).

47873218 is a wasteful number, since it uses less digits than its factorization.

47873218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23936611.

The product of its digits is 75264, while the sum is 40.

The square root of 47873218 is about 6919.0474777963. The cubic root of 47873218 is about 363.1038667426.

The spelling of 47873218 in words is "forty-seven million, eight hundred seventy-three thousand, two hundred eighteen".