688394 has 8 divisors (see below), whose sum is σ = 1180128. Its totient is φ = 295020.

The previous prime is 688393. The next prime is 688397. The reversal of 688394 is 493886.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (688393) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24572 + ... + 24599.

It is an arithmetic number, because the mean of its divisors is an integer number (147516).

2⁶⁸⁸³⁹⁴ is an apocalyptic number.

688394 is a deficient number, since it is larger than the sum of its proper divisors (491734).

688394 is a wasteful number, since it uses less digits than its factorization.

688394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49180.

The product of its digits is 41472, while the sum is 38.

The square root of 688394 is about 829.6951247296. The cubic root of 688394 is about 88.2969479511.

The spelling of 688394 in words is "six hundred eighty-eight thousand, three hundred ninety-four".