686836397 has 16 divisors (see below), whose sum is σ = 786687552. Its totient is φ = 594036480.

The previous prime is 686836351. The next prime is 686836417. The reversal of 686836397 is 793638686.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686836397 is a prime.

It is a super-3 number, since 3×686836397³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686836597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 43322 + ... + 57012.

It is an arithmetic number, because the mean of its divisors is an integer number (49167972).

Almost surely, 2^686836397 is an apocalyptic number.

It is an amenable number.

686836397 is a deficient number, since it is larger than the sum of its proper divisors (99851155).

686836397 is a wasteful number, since it uses less digits than its factorization.

686836397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13948.

The product of its digits is 7838208, while the sum is 56.

The square root of 686836397 is about 26207.5637364483. The cubic root of 686836397 is about 882.3030227499.

The spelling of 686836397 in words is "six hundred eighty-six million, eight hundred thirty-six thousand, three hundred ninety-seven".