16689857 has 2 divisors, whose sum is σ = 16689858. Its totient is φ = 16689856.

The previous prime is 16689853. The next prime is 16689863. The reversal of 16689857 is 75898661.

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., 16248961 + 440896 = 4031^2 + 664^2 .

It is a cyclic number.

It is not a de Polignac number, because 16689857 - 2² = 16689853 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16689851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8344928 + 8344929.

It is an arithmetic number, because the mean of its divisors is an integer number (8344929).

Almost surely, 2^16689857 is an apocalyptic number.

It is an amenable number.

16689857 is a deficient number, since it is larger than the sum of its proper divisors (1).

16689857 is an equidigital number, since it uses as much as digits as its factorization.

16689857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 725760, while the sum is 50.

The square root of 16689857 is about 4085.3221415208. The cubic root of 16689857 is about 255.5548956995.

The spelling of 16689857 in words is "sixteen million, six hundred eighty-nine thousand, eight hundred fifty-seven".