69999 has 4 divisors (see below), whose sum is σ = 93336. Its totient is φ = 46664.

The previous prime is 69997. The next prime is 70001. The reversal of 69999 is 99996.

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

It is an interprime number because it is at equal distance from previous prime (69997) and next prime (70001).

It is a cyclic number.

It is not a de Polignac number, because 69999 - 2¹ = 69997 is a prime.

It is a D-number.

69999 is a modest number, since divided by 999 gives 69 as remainder.

69999 is a lucky number.

It is a plaindrome in base 10 and base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 69999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69991) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11664 + ... + 11669.

It is an arithmetic number, because the mean of its divisors is an integer number (23334).

2⁶⁹⁹⁹⁹ is an apocalyptic number.

69999 is a deficient number, since it is larger than the sum of its proper divisors (23337).

69999 is a wasteful number, since it uses less digits than its factorization.

69999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23336.

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

The square root of 69999 is about 264.5732412773. The cubic root of 69999 is about 41.2126567455.

The spelling of 69999 in words is "sixty-nine thousand, nine hundred ninety-nine".