16945639 has 2 divisors, whose sum is σ = 16945640. Its totient is φ = 16945638.

The previous prime is 16945631. The next prime is 16945661. The reversal of 16945639 is 93654961.

It is a weak prime.

It is an emirp because it is prime and its reverse (93654961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16945639 - 2³ = 16945631 is a prime.

It is a super-2 number, since 2×16945639² = 574309362236642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16945595 and 16945604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16945631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8472819 + 8472820.

It is an arithmetic number, because the mean of its divisors is an integer number (8472820).

Almost surely, 2^16945639 is an apocalyptic number.

16945639 is a deficient number, since it is larger than the sum of its proper divisors (1).

16945639 is an equidigital number, since it uses as much as digits as its factorization.

16945639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 174960, while the sum is 43.

The square root of 16945639 is about 4116.5081076077. The cubic root of 16945639 is about 256.8537930014.

The spelling of 16945639 in words is "sixteen million, nine hundred forty-five thousand, six hundred thirty-nine".