16939687 has 2 divisors, whose sum is σ = 16939688. Its totient is φ = 16939686.

The previous prime is 16939679. The next prime is 16939691. The reversal of 16939687 is 78693961.

It is a strong prime.

It is an emirp because it is prime and its reverse (78693961) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16939687 - 2³ = 16939679 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 16939687.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16939627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8469843 + 8469844.

It is an arithmetic number, because the mean of its divisors is an integer number (8469844).

Almost surely, 2^16939687 is an apocalyptic number.

16939687 is a deficient number, since it is larger than the sum of its proper divisors (1).

16939687 is an equidigital number, since it uses as much as digits as its factorization.

16939687 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 16939687 is about 4115.7851012899. The cubic root of 16939687 is about 256.8237169682.

The spelling of 16939687 in words is "sixteen million, nine hundred thirty-nine thousand, six hundred eighty-seven".