686973906 has 16 divisors (see below), whose sum is σ = 1526608800. Its totient is φ = 228991284.

The previous prime is 686973883. The next prime is 686973923. The reversal of 686973906 is 609379686.

It is a happy number.

686973906 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 12721739 = 686973906 / (6 + 8 + 6 + 9 + 7 + 3 + 9 + 0 + 6).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6360816 + ... + 6360923.

It is an arithmetic number, because the mean of its divisors is an integer number (95413050).

Almost surely, 2^686973906 is an apocalyptic number.

686973906 is an abundant number, since it is smaller than the sum of its proper divisors (839634894).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

686973906 is a wasteful number, since it uses less digits than its factorization.

686973906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12721750 (or 12721744 counting only the distinct ones).

The product of its (nonzero) digits is 2939328, while the sum is 54.

The square root of 686973906 is about 26210.1870653378. The cubic root of 686973906 is about 882.3618997067.

The spelling of 686973906 in words is "six hundred eighty-six million, nine hundred seventy-three thousand, nine hundred six".