47857239 has 12 divisors (see below), whose sum is σ = 69240600. Its totient is φ = 31852464.

The previous prime is 47857231. The next prime is 47857241. The reversal of 47857239 is 93275874.

47857239 is a `hidden beast` number, since 4 + 78 + 572 + 3 + 9 = 666.

It is not a de Polignac number, because 47857239 - 2³ = 47857231 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 47857194 and 47857203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47857231) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1897 + ... + 9965.

It is an arithmetic number, because the mean of its divisors is an integer number (5770050).

Almost surely, 2^47857239 is an apocalyptic number.

47857239 is a deficient number, since it is larger than the sum of its proper divisors (21383361).

47857239 is a wasteful number, since it uses less digits than its factorization.

47857239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8734 (or 8731 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 47857239 is about 6917.8926704597. The cubic root of 47857239 is about 363.0634636211.

The spelling of 47857239 in words is "forty-seven million, eight hundred fifty-seven thousand, two hundred thirty-nine".