47778123 has 4 divisors (see below), whose sum is σ = 63704168. Its totient is φ = 31852080.

The previous prime is 47778121. The next prime is 47778127. The reversal of 47778123 is 32187774.

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

It is not a de Polignac number, because 47778123 - 2¹ = 47778121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47778121) 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, 7963018 + ... + 7963023.

It is an arithmetic number, because the mean of its divisors is an integer number (15926042).

Almost surely, 2^47778123 is an apocalyptic number.

47778123 is a deficient number, since it is larger than the sum of its proper divisors (15926045).

47778123 is a wasteful number, since it uses less digits than its factorization.

47778123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15926044.

The product of its digits is 65856, while the sum is 39.

The square root of 47778123 is about 6912.1720898716. The cubic root of 47778123 is about 362.8632851128.

The spelling of 47778123 in words is "forty-seven million, seven hundred seventy-eight thousand, one hundred twenty-three".