16857947 has 2 divisors, whose sum is σ = 16857948. Its totient is φ = 16857946.

The previous prime is 16857923. The next prime is 16857979. The reversal of 16857947 is 74975861.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16857947 - 2⁸ = 16857691 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16857917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8428973 + 8428974.

It is an arithmetic number, because the mean of its divisors is an integer number (8428974).

Almost surely, 2^16857947 is an apocalyptic number.

16857947 is a deficient number, since it is larger than the sum of its proper divisors (1).

16857947 is an equidigital number, since it uses as much as digits as its factorization.

16857947 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 47.

The square root of 16857947 is about 4105.8430315832. The cubic root of 16857947 is about 256.4099622298.

The spelling of 16857947 in words is "sixteen million, eight hundred fifty-seven thousand, nine hundred forty-seven".