16971239 has 2 divisors, whose sum is σ = 16971240. Its totient is φ = 16971238.

The previous prime is 16971223. The next prime is 16971257. The reversal of 16971239 is 93217961.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 16971239 - 2⁴ = 16971223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16971209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8485619 + 8485620.

It is an arithmetic number, because the mean of its divisors is an integer number (8485620).

Almost surely, 2^16971239 is an apocalyptic number.

16971239 is a deficient number, since it is larger than the sum of its proper divisors (1).

16971239 is an equidigital number, since it uses as much as digits as its factorization.

16971239 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20412, while the sum is 38.

The square root of 16971239 is about 4119.6163656341. The cubic root of 16971239 is about 256.9830720580.

The spelling of 16971239 in words is "sixteen million, nine hundred seventy-one thousand, two hundred thirty-nine".