47857657 has 2 divisors, whose sum is σ = 47857658. Its totient is φ = 47857656.

The previous prime is 47857643. The next prime is 47857681. The reversal of 47857657 is 75675874.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 42198016 + 5659641 = 6496^2 + 2379^2 .

It is a cyclic number.

It is not a de Polignac number, because 47857657 - 2¹¹ = 47855609 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47857657.

It is not a weakly prime, because it can be changed into another prime (47857157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23928828 + 23928829.

It is an arithmetic number, because the mean of its divisors is an integer number (23928829).

Almost surely, 2^47857657 is an apocalyptic number.

It is an amenable number.

47857657 is a deficient number, since it is larger than the sum of its proper divisors (1).

47857657 is an equidigital number, since it uses as much as digits as its factorization.

47857657 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1646400, while the sum is 49.

The square root of 47857657 is about 6917.9228819061. The cubic root of 47857657 is about 363.0645206544.

The spelling of 47857657 in words is "forty-seven million, eight hundred fifty-seven thousand, six hundred fifty-seven".