689453809 has 8 divisors (see below), whose sum is σ = 754367328. Its totient is φ = 624912960.

The previous prime is 689453803. The next prime is 689453813. The reversal of 689453809 is 908354986.

It is a happy number.

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 689453809 - 2¹⁵ = 689421041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (689453803) 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, 89287 + ... + 96700.

It is an arithmetic number, because the mean of its divisors is an integer number (94295916).

Almost surely, 2^689453809 is an apocalyptic number.

It is an amenable number.

689453809 is a deficient number, since it is larger than the sum of its proper divisors (64913519).

689453809 is a wasteful number, since it uses less digits than its factorization.

689453809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186335.

The product of its (nonzero) digits is 1866240, while the sum is 52.

The square root of 689453809 is about 26257.4524468769. The cubic root of 689453809 is about 883.4223689851.

The spelling of 689453809 in words is "six hundred eighty-nine million, four hundred fifty-three thousand, eight hundred nine".