1212685686 has 48 divisors (see below), whose sum is σ = 2681814096. Its totient is φ = 395898048.

The previous prime is 1212685637. The next prime is 1212685717. The reversal of 1212685686 is 6865862121.

1212685686 is a `hidden beast` number, since 1 + 21 + 2 + 68 + 568 + 6 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1042141 + ... + 1043303.

It is an arithmetic number, because the mean of its divisors is an integer number (55871127).

Almost surely, 2^1212685686 is an apocalyptic number.

1212685686 is an abundant number, since it is smaller than the sum of its proper divisors (1469128410).

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

1212685686 is a wasteful number, since it uses less digits than its factorization.

1212685686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2317 (or 2314 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 1212685686 is about 34823.6368864597. The cubic root of 1212685686 is about 1066.3900489526.

The spelling of 1212685686 in words is "one billion, two hundred twelve million, six hundred eighty-five thousand, six hundred eighty-six".