690999 has 12 divisors (see below), whose sum is σ = 979944. Its totient is φ = 433024.

The previous prime is 690997. The next prime is 691001. The reversal of 690999 is 999096.

It is an interprime number because it is at equal distance from previous prime (690997) and next prime (691001).

It is not a de Polignac number, because 690999 - 2¹ = 690997 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

690999 is a modest number, since divided by 999 gives 690 as remainder.

690999 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 690999.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 690999.

It is not an unprimeable number, because it can be changed into a prime (690997) 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 in 11 ways as a sum of consecutive naturals, for example, 469 + ... + 1265.

It is an arithmetic number, because the mean of its divisors is an integer number (81662).

2⁶⁹⁰⁹⁹⁹ is an apocalyptic number.

690999 is a deficient number, since it is larger than the sum of its proper divisors (288945).

690999 is a wasteful number, since it uses less digits than its factorization.

690999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 834 (or 817 counting only the distinct ones).

The product of its (nonzero) digits is 39366, while the sum is 42.

The square root of 690999 is about 831.2634961310. The cubic root of 690999 is about 88.4081846465.

The spelling of 690999 in words is "six hundred ninety thousand, nine hundred ninety-nine".