686225949 has 16 divisors (see below), whose sum is σ = 937992000. Its totient is φ = 446011776.

The previous prime is 686225941. The next prime is 686225963. The reversal of 686225949 is 949522686.

It is not a de Polignac number, because 686225949 - 2³ = 686225941 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (686225941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68727 + ... + 78075.

It is an arithmetic number, because the mean of its divisors is an integer number (58624500).

Almost surely, 2^686225949 is an apocalyptic number.

It is an amenable number.

686225949 is a deficient number, since it is larger than the sum of its proper divisors (251766051).

686225949 is a wasteful number, since it uses less digits than its factorization.

686225949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9964.

The product of its digits is 1866240, while the sum is 51.

The square root of 686225949 is about 26195.9147387527. The cubic root of 686225949 is about 882.0415535156.

The spelling of 686225949 in words is "six hundred eighty-six million, two hundred twenty-five thousand, nine hundred forty-nine".