689957409 has 8 divisors (see below), whose sum is σ = 920092480. Its totient is φ = 459896976.

The previous prime is 689957377. The next prime is 689957413. The reversal of 689957409 is 904759986.

689957409 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 not a de Polignac number, because 689957409 - 2⁵ = 689957377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689957419) 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, 8604 + ... + 38130.

It is an arithmetic number, because the mean of its divisors is an integer number (115011560).

Almost surely, 2^689957409 is an apocalyptic number.

It is an amenable number.

689957409 is a deficient number, since it is larger than the sum of its proper divisors (230135071).

689957409 is a wasteful number, since it uses less digits than its factorization.

689957409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37319.

The product of its (nonzero) digits is 4898880, while the sum is 57.

The square root of 689957409 is about 26267.0403547868. The cubic root of 689957409 is about 883.6374103323.

The spelling of 689957409 in words is "six hundred eighty-nine million, nine hundred fifty-seven thousand, four hundred nine".