689955 has 16 divisors (see below), whose sum is σ = 1261824. Its totient is φ = 315360.

The previous prime is 689951. The next prime is 689957. The reversal of 689955 is 559986.

It is not a de Polignac number, because 689955 - 2² = 689951 is a prime.

689955 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (689951) 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, 3181 + ... + 3390.

It is an arithmetic number, because the mean of its divisors is an integer number (78864).

2⁶⁸⁹⁹⁵⁵ is an apocalyptic number.

689955 is a deficient number, since it is larger than the sum of its proper divisors (571869).

689955 is a wasteful number, since it uses less digits than its factorization.

689955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6586.

The product of its digits is 97200, while the sum is 42.

The square root of 689955 is about 830.6352990332. The cubic root of 689955 is about 88.3636381919.

The spelling of 689955 in words is "six hundred eighty-nine thousand, nine hundred fifty-five".