816699 has 16 divisors (see below), whose sum is σ = 1202432. Its totient is φ = 489888.

The previous prime is 816691. The next prime is 816703. The reversal of 816699 is 996618.

It is not a de Polignac number, because 816699 - 2³ = 816691 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Duffinian number.

816699 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (816691) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1434 + ... + 1920.

It is an arithmetic number, because the mean of its divisors is an integer number (75152).

2⁸¹⁶⁶⁹⁹ is an apocalyptic number.

816699 is a deficient number, since it is larger than the sum of its proper divisors (385733).

816699 is a wasteful number, since it uses less digits than its factorization.

816699 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 546.

The product of its digits is 23328, while the sum is 39.

The square root of 816699 is about 903.7140034325. The cubic root of 816699 is about 93.4732496134.

The spelling of 816699 in words is "eight hundred sixteen thousand, six hundred ninety-nine".