686354997 has 4 divisors (see below), whose sum is σ = 915140000. Its totient is φ = 457569996.

The previous prime is 686354969. The next prime is 686355011. The reversal of 686354997 is 799453686.

It is a happy number.

686354997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 686354997 - 2⁷ = 686354869 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686354197) 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, 114392497 + ... + 114392502.

It is an arithmetic number, because the mean of its divisors is an integer number (228785000).

Almost surely, 2^686354997 is an apocalyptic number.

It is an amenable number.

686354997 is a deficient number, since it is larger than the sum of its proper divisors (228785003).

686354997 is a wasteful number, since it uses less digits than its factorization.

686354997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228785002.

The product of its digits is 9797760, while the sum is 57.

The square root of 686354997 is about 26198.3777551206. The cubic root of 686354997 is about 882.0968407302.

The spelling of 686354997 in words is "six hundred eighty-six million, three hundred fifty-four thousand, nine hundred ninety-seven".