686672123 has 2 divisors, whose sum is σ = 686672124. Its totient is φ = 686672122.

The previous prime is 686672111. The next prime is 686672131. The reversal of 686672123 is 321276686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686672123 - 2¹⁰ = 686671099 is a prime.

It is not a weakly prime, because it can be changed into another prime (686672183) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343336061 + 343336062.

It is an arithmetic number, because the mean of its divisors is an integer number (343336062).

Almost surely, 2^686672123 is an apocalyptic number.

686672123 is a deficient number, since it is larger than the sum of its proper divisors (1).

686672123 is an equidigital number, since it uses as much as digits as its factorization.

686672123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 145152, while the sum is 41.

The square root of 686672123 is about 26204.4294538156. The cubic root of 686672123 is about 882.2326755735.

The spelling of 686672123 in words is "six hundred eighty-six million, six hundred seventy-two thousand, one hundred twenty-three".