16239857 has 2 divisors, whose sum is σ = 16239858. Its totient is φ = 16239856.

The previous prime is 16239827. The next prime is 16239859. The reversal of 16239857 is 75893261.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15437041 + 802816 = 3929^2 + 896^2 .

It is a cyclic number.

It is not a de Polignac number, because 16239857 - 2¹² = 16235761 is a prime.

Together with 16239859, 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 (16239859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8119928 + 8119929.

It is an arithmetic number, because the mean of its divisors is an integer number (8119929).

Almost surely, 2^16239857 is an apocalyptic number.

It is an amenable number.

16239857 is a deficient number, since it is larger than the sum of its proper divisors (1).

16239857 is an equidigital number, since it uses as much as digits as its factorization.

16239857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 41.

The square root of 16239857 is about 4029.8705934558. The cubic root of 16239857 is about 253.2371401104.

The spelling of 16239857 in words is "sixteen million, two hundred thirty-nine thousand, eight hundred fifty-seven".