689240194 has 8 divisors (see below), whose sum is σ = 1035445500. Its totient is φ = 344091696.

The previous prime is 689240171. The next prime is 689240203. The reversal of 689240194 is 491042986.

It can be written as a sum of positive squares in 2 ways, for example, as 664866225 + 24373969 = 25785^2 + 4937^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 689240194.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 262569 + ... + 265180.

Almost surely, 2^689240194 is an apocalyptic number.

689240194 is a deficient number, since it is larger than the sum of its proper divisors (346205306).

689240194 is a wasteful number, since it uses less digits than its factorization.

689240194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528404.

The product of its (nonzero) digits is 124416, while the sum is 43.

The square root of 689240194 is about 26253.3844294407. The cubic root of 689240194 is about 883.3311219912.

The spelling of 689240194 in words is "six hundred eighty-nine million, two hundred forty thousand, one hundred ninety-four".