686940707 has 2 divisors, whose sum is σ = 686940708. Its totient is φ = 686940706.

The previous prime is 686940677. The next prime is 686940713. The reversal of 686940707 is 707049686.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 686940707 - 2⁶ = 686940643 is a prime.

It is not a weakly prime, because it can be changed into another prime (686943707) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343470353 + 343470354.

It is an arithmetic number, because the mean of its divisors is an integer number (343470354).

Almost surely, 2^686940707 is an apocalyptic number.

686940707 is a deficient number, since it is larger than the sum of its proper divisors (1).

686940707 is an equidigital number, since it uses as much as digits as its factorization.

686940707 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The square root of 686940707 is about 26209.5537352317. The cubic root of 686940707 is about 882.3476856760.

The spelling of 686940707 in words is "six hundred eighty-six million, nine hundred forty thousand, seven hundred seven".