689401947 has 32 divisors (see below), whose sum is σ = 1049771520. Its totient is φ = 398926080.

The previous prime is 689401939. The next prime is 689401957. The reversal of 689401947 is 749104986.

689401947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 689401947 - 2³ = 689401939 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 689401896 and 689401905.

It is not an unprimeable number, because it can be changed into a prime (689401957) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98122 + ... + 104912.

It is an arithmetic number, because the mean of its divisors is an integer number (32805360).

Almost surely, 2^689401947 is an apocalyptic number.

689401947 is a deficient number, since it is larger than the sum of its proper divisors (360369573).

689401947 is a wasteful number, since it uses less digits than its factorization.

689401947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6963.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 689401947 is about 26256.4648610585. The cubic root of 689401947 is about 883.4002175375.

The spelling of 689401947 in words is "six hundred eighty-nine million, four hundred one thousand, nine hundred forty-seven".