688197 has 4 divisors (see below), whose sum is σ = 917600. Its totient is φ = 458796.

The previous prime is 688187. The next prime is 688201. The reversal of 688197 is 791886.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 688197 - 2⁶ = 688133 is a prime.

It is a super-2 number, since 2×688197² = 947230221618, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (688147) 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, 114697 + ... + 114702.

It is an arithmetic number, because the mean of its divisors is an integer number (229400).

2⁶⁸⁸¹⁹⁷ is an apocalyptic number.

It is an amenable number.

688197 is a deficient number, since it is larger than the sum of its proper divisors (229403).

688197 is a wasteful number, since it uses less digits than its factorization.

688197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 229402.

The product of its digits is 24192, while the sum is 39.

The square root of 688197 is about 829.5763979285. The cubic root of 688197 is about 88.2885244038.

The spelling of 688197 in words is "six hundred eighty-eight thousand, one hundred ninety-seven".