689238739 has 8 divisors (see below), whose sum is σ = 797672960. Its totient is φ = 583297416.

The previous prime is 689238733. The next prime is 689238793. The reversal of 689238739 is 937832986.

It is a happy number.

689238739 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 689238739 - 2³ = 689238731 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 689238739.

It is not an unprimeable number, because it can be changed into a prime (689238731) 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, 622629 + ... + 623734.

It is an arithmetic number, because the mean of its divisors is an integer number (99709120).

Almost surely, 2^689238739 is an apocalyptic number.

689238739 is a deficient number, since it is larger than the sum of its proper divisors (108434221).

689238739 is a wasteful number, since it uses less digits than its factorization.

689238739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246449.

The product of its digits is 3919104, while the sum is 55.

The square root of 689238739 is about 26253.3567187131. The cubic root of 689238739 is about 883.3305004142.

The spelling of 689238739 in words is "six hundred eighty-nine million, two hundred thirty-eight thousand, seven hundred thirty-nine".