699987 has 4 divisors (see below), whose sum is σ = 933320. Its totient is φ = 466656.

The previous prime is 699967. The next prime is 700001. The reversal of 699987 is 789996.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 699987 - 2¹⁴ = 683603 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (699947) 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 3 ways as a sum of consecutive naturals, for example, 116662 + ... + 116667.

It is an arithmetic number, because the mean of its divisors is an integer number (233330).

2⁶⁹⁹⁹⁸⁷ is an apocalyptic number.

699987 is a deficient number, since it is larger than the sum of its proper divisors (233333).

699987 is a wasteful number, since it uses less digits than its factorization.

699987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 233332.

The product of its digits is 244944, while the sum is 48.

The square root of 699987 is about 836.6522575120. The cubic root of 699987 is about 88.7898505160.

Subtracting 699987 from its reverse (789996), we obtain a palindrome (90009).

The spelling of 699987 in words is "six hundred ninety-nine thousand, nine hundred eighty-seven".