47638291 has 4 divisors (see below), whose sum is σ = 47823912. Its totient is φ = 47452672.

The previous prime is 47638259. The next prime is 47638319. The reversal of 47638291 is 19283674.

47638291 = T₅₆₃₄ + T₅₆₃₅ + T₅₆₃₆.

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

It is a cyclic number.

It is not a de Polignac number, because 47638291 - 2⁵ = 47638259 is a prime.

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 a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47638091) 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, 92425 + ... + 92938.

It is an arithmetic number, because the mean of its divisors is an integer number (11955978).

Almost surely, 2^47638291 is an apocalyptic number.

47638291 is the 5636-th centered triangular number.

47638291 is a deficient number, since it is larger than the sum of its proper divisors (185621).

47638291 is a wasteful number, since it uses less digits than its factorization.

47638291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185620.

The product of its digits is 72576, while the sum is 40.

The square root of 47638291 is about 6902.0497680037. The cubic root of 47638291 is about 362.5089424667.

The spelling of 47638291 in words is "forty-seven million, six hundred thirty-eight thousand, two hundred ninety-one".