16428857 has 2 divisors, whose sum is σ = 16428858. Its totient is φ = 16428856.

The previous prime is 16428829. The next prime is 16428871. The reversal of 16428857 is 75882461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14409616 + 2019241 = 3796^2 + 1421^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16428857 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (16428157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8214428 + 8214429.

It is an arithmetic number, because the mean of its divisors is an integer number (8214429).

Almost surely, 2^16428857 is an apocalyptic number.

It is an amenable number.

16428857 is a deficient number, since it is larger than the sum of its proper divisors (1).

16428857 is an equidigital number, since it uses as much as digits as its factorization.

16428857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 107520, while the sum is 41.

The square root of 16428857 is about 4053.2526444820. The cubic root of 16428857 is about 254.2157476239.

The spelling of 16428857 in words is "sixteen million, four hundred twenty-eight thousand, eight hundred fifty-seven".