16398857 has 2 divisors, whose sum is σ = 16398858. Its totient is φ = 16398856.

The previous prime is 16398847. The next prime is 16398859. The reversal of 16398857 is 75889361.

It is a happy number.

16398857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16289296 + 109561 = 4036^2 + 331^2 .

It is a cyclic number.

It is not a de Polignac number, because 16398857 - 2⁴ = 16398841 is a prime.

Together with 16398859, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16398859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8199428 + 8199429.

It is an arithmetic number, because the mean of its divisors is an integer number (8199429).

Almost surely, 2^16398857 is an apocalyptic number.

It is an amenable number.

16398857 is a deficient number, since it is larger than the sum of its proper divisors (1).

16398857 is an equidigital number, since it uses as much as digits as its factorization.

16398857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 362880, while the sum is 47.

The square root of 16398857 is about 4049.5502219382. The cubic root of 16398857 is about 254.0609160114.

The spelling of 16398857 in words is "sixteen million, three hundred ninety-eight thousand, eight hundred fifty-seven".