47318857 has 4 divisors (see below), whose sum is σ = 47345920. Its totient is φ = 47291796.

The previous prime is 47318851. The next prime is 47318861. The reversal of 47318857 is 75881374.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75881374 = 2 ⋅37940687.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47318857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47318851) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10713 + ... + 14470.

It is an arithmetic number, because the mean of its divisors is an integer number (11836480).

Almost surely, 2^47318857 is an apocalyptic number.

It is an amenable number.

47318857 is a deficient number, since it is larger than the sum of its proper divisors (27063).

47318857 is a wasteful number, since it uses less digits than its factorization.

47318857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27062.

The product of its digits is 188160, while the sum is 43.

The square root of 47318857 is about 6878.8703287677. The cubic root of 47318857 is about 361.6968683206.

The spelling of 47318857 in words is "forty-seven million, three hundred eighteen thousand, eight hundred fifty-seven".