689927939 has 4 divisors (see below), whose sum is σ = 690728256. Its totient is φ = 689127624.

The previous prime is 689927933. The next prime is 689927947. The reversal of 689927939 is 939729986.

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 689927939 - 2¹⁶ = 689862403 is a prime.

It is a super-2 number, since 2×689927939² = 952001122025575442, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689927933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398864 + ... + 400589.

It is an arithmetic number, because the mean of its divisors is an integer number (172682064).

Almost surely, 2^689927939 is an apocalyptic number.

689927939 is a deficient number, since it is larger than the sum of its proper divisors (800317).

689927939 is an equidigital number, since it uses as much as digits as its factorization.

689927939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 800316.

The product of its digits is 13226976, while the sum is 62.

The square root of 689927939 is about 26266.4793796199. The cubic root of 689927939 is about 883.6248292826.

The spelling of 689927939 in words is "six hundred eighty-nine million, nine hundred twenty-seven thousand, nine hundred thirty-nine".