816887 has 2 divisors, whose sum is σ = 816888. Its totient is φ = 816886.

The previous prime is 816883. The next prime is 816899. The reversal of 816887 is 788618.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 816887 - 2² = 816883 is a prime.

It is a Chen prime.

It is a plaindrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 816887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (816883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 408443 + 408444.

It is an arithmetic number, because the mean of its divisors is an integer number (408444).

2⁸¹⁶⁸⁸⁷ is an apocalyptic number.

816887 is a deficient number, since it is larger than the sum of its proper divisors (1).

816887 is an equidigital number, since it uses as much as digits as its factorization.

816887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21504, while the sum is 38.

The square root of 816887 is about 903.8180126552. The cubic root of 816887 is about 93.4804214203.

The spelling of 816887 in words is "eight hundred sixteen thousand, eight hundred eighty-seven".