689121986 has 16 divisors (see below), whose sum is σ = 1205462400. Its totient is φ = 295337700.

The previous prime is 689121893. The next prime is 689121989.

It is a happy number.

689121986 is nontrivially palindromic in base 10.

It is a super-2 number, since 2×689121986² = 949778223177168392, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (689121989) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501590 + ... + 502961.

It is an arithmetic number, because the mean of its divisors is an integer number (75341400).

Almost surely, 2^689121986 is an apocalyptic number.

689121986 is a deficient number, since it is larger than the sum of its proper divisors (516340414).

689121986 is a wasteful number, since it uses less digits than its factorization.

689121986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004574 (or 1004560 counting only the distinct ones).

The product of its digits is 373248, while the sum is 50.

The square root of 689121986 is about 26251.1330422136. The cubic root of 689121986 is about 883.2806205956.

The spelling of 689121986 in words is "six hundred eighty-nine million, one hundred twenty-one thousand, nine hundred eighty-six".