686672923 has 2 divisors, whose sum is σ = 686672924. Its totient is φ = 686672922.

The previous prime is 686672851. The next prime is 686672947. The reversal of 686672923 is 329276686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686672923 is a prime.

It is not a weakly prime, because it can be changed into another prime (686672123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343336461 + 343336462.

It is an arithmetic number, because the mean of its divisors is an integer number (343336462).

Almost surely, 2^686672923 is an apocalyptic number.

686672923 is a deficient number, since it is larger than the sum of its proper divisors (1).

686672923 is an equidigital number, since it uses as much as digits as its factorization.

686672923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1306368, while the sum is 49.

The square root of 686672923 is about 26204.4447184061. Note that the first 3 decimals coincide. The cubic root of 686672923 is about 882.2330181853.

The spelling of 686672923 in words is "six hundred eighty-six million, six hundred seventy-two thousand, nine hundred twenty-three".