47172218 has 8 divisors (see below), whose sum is σ = 73834848. Its totient is φ = 22560604.

The previous prime is 47172199. The next prime is 47172227. The reversal of 47172218 is 81227174.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 512696 + ... + 512787.

It is an arithmetic number, because the mean of its divisors is an integer number (9229356).

Almost surely, 2^47172218 is an apocalyptic number.

47172218 is a deficient number, since it is larger than the sum of its proper divisors (26662630).

47172218 is a wasteful number, since it uses less digits than its factorization.

47172218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1025508.

The product of its digits is 6272, while the sum is 32.

The square root of 47172218 is about 6868.2034040934. The cubic root of 47172218 is about 361.3228542853.

The spelling of 47172218 in words is "forty-seven million, one hundred seventy-two thousand, two hundred eighteen".