689399 has 4 divisors (see below), whose sum is σ = 692664. Its totient is φ = 686136.

The previous prime is 689393. The next prime is 689411. The reversal of 689399 is 993986.

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

It is a cyclic number.

It is not a de Polignac number, because 689399 - 2⁴ = 689383 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689393) 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, 1292 + ... + 1745.

It is an arithmetic number, because the mean of its divisors is an integer number (173166).

2⁶⁸⁹³⁹⁹ is an apocalyptic number.

689399 is a deficient number, since it is larger than the sum of its proper divisors (3265).

689399 is a wasteful number, since it uses less digits than its factorization.

689399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3264.

The product of its digits is 104976, while the sum is 44.

The square root of 689399 is about 830.3005479945. The cubic root of 689399 is about 88.3398958773.

It can be divided in two parts, 689 and 399, that multiplied together give a triangular number (274911 = T₇₄₁).

The spelling of 689399 in words is "six hundred eighty-nine thousand, three hundred ninety-nine".