689381 has 12 divisors (see below), whose sum is σ = 875520. Its totient is φ = 536760.

The previous prime is 689369. The next prime is 689383. The reversal of 689381 is 183986.

It is not a de Polignac number, because 689381 - 2⁶ = 689317 is a prime.

It is a super-2 number, since 2×689381² = 950492326322, which contains 22 as substring.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689383) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 101 + ... + 1178.

It is an arithmetic number, because the mean of its divisors is an integer number (72960).

2⁶⁸⁹³⁸¹ is an apocalyptic number.

It is an amenable number.

689381 is a deficient number, since it is larger than the sum of its proper divisors (186139).

689381 is a wasteful number, since it uses less digits than its factorization.

689381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1304 (or 1297 counting only the distinct ones).

The product of its digits is 10368, while the sum is 35.

The square root of 689381 is about 830.2897084753. The cubic root of 689381 is about 88.3391270279.

It can be divided in two parts, 68 and 9381, that added together give a palindrome (9449).

The spelling of 689381 in words is "six hundred eighty-nine thousand, three hundred eighty-one".