689973221 has 8 divisors (see below), whose sum is σ = 792947520. Its totient is φ = 588100608.

The previous prime is 689973217. The next prime is 689973223. The reversal of 689973221 is 122379986.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 689973221 - 2² = 689973217 is a prime.

It is a super-2 number, since 2×689973221² = 952126091394229682, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (689973223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 274076 + ... + 276581.

It is an arithmetic number, because the mean of its divisors is an integer number (99118440).

Almost surely, 2^689973221 is an apocalyptic number.

It is an amenable number.

689973221 is a deficient number, since it is larger than the sum of its proper divisors (102974299).

689973221 is a wasteful number, since it uses less digits than its factorization.

689973221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 550843.

The product of its digits is 326592, while the sum is 47.

The square root of 689973221 is about 26267.3413386281. The cubic root of 689973221 is about 883.6441604919.

The spelling of 689973221 in words is "six hundred eighty-nine million, nine hundred seventy-three thousand, two hundred twenty-one".